Mathematics High School

Solve the system of linear equations by substitution.
1/2x +y=-4
y = 2x + 16

Answers

Answer 1
sub 2x+16 for y into the 1st line so
1/2x+2x+16=-4 now find x
which is x=8 not plug in -8 for x, does not matter which one
you will get y=0
answer•
x=-8
y=0
(-8,0)
Answer 2

Answer:

y = 0

x = -8

Step-by-step explanation:

1/2x + y = - 4

y = 2x + 16

1/2x + (2x + 16) = - 4

1/2x + 2x = - 4 - 16

5/2x = -20

2/5 x 5/2x = -20 x 2/5

x = -40/5

x = -8

y = 2x + 16

y = 2(-8) + 16

y = -16 + 16

y = 0

Check:

1/2x + y = - 4

y = 2x + 16

1/2(-8) + (0) = -4

-4 + 0 = -4

-4 = -4

y = 2x + 16

(0) = 2(-8) + 16

0 = -16 + 16

0 = 0

Related Questions

How do I solve this equation by completing the square. 4X^2 + 12x +5 = 21

Answers

The Answer is: x1=-4 x2=1.

transversals angles​

Answers

B. 2 because it is inside and on the same side as 1

Pls help fast will give brainliest

Answers

Answer:

23

Step-by-step explanation:

6×3+5(3-2)

6×3+5×1

18+5

23

v=u + at
u= 2
a= -5
t = 1/2
Work out the value of v.

Answers

Answer:

V= -1/2

Step-by-step explanation:

You would have to add U+AT to get V

If A=-5 and T=1/2, then -5*1/2= -2.5 (A*T)

Then, adding U (which is 2), gives -.5, or -1/2

What is the ratio 28 : 35 written in lowest terms?
A.9: 15
B.7:19
C.4:5
D.3:7​

Answers

Answer:

4:5

Step-by-step explanation:

both sides divide by 7

can someone answer the questions on my page if so ill give all the correct answers brainlist.

Answers

Oh okay that’s a bet

y = m + mnp
Solve for n.
pls help me

Answers

Answer:

n = y - m/mp

Step-by-step explanation:

y = m + mnp

y - m = mnp

y - m/mp = mnp/mp

y - m/mp = n

I need help with this​

Answers

Answer:

24.3470022334

Step-by-step explanation:

I hope this helps. It really isn’t too hard. All you need to do is find the multiples of 24

Find two numbers with sum 82 and difference 30.

Answers

Answer: I think it would be 112.

Step-by-step explanation:

The total cost of renting a banquet hall is a function of the number of hours the
hall is rented. The owner of the banquet hall charges $45 per half hour up to a
maximum of 5 hours and a $50 cleaning fee. The equation used to express the
situation is C = 45h + 50, where h is the number of half hours. What is the
greatest value in the range for this situation?

Answers

9514 1404 393

Answer:

  $500

Step-by-step explanation:

The greatest rental time is 5 hours, which is 10 half-hours. The value of C for h=10 is ...

  C = 45·10 +50 = 450 +50 = 500

The greatest value in the range for this situation is $500.

What is 149/15 as a mixed number?

Answers

Answer:

its an improper

mixed : 9 14/15

Step-by-step explanation:

its a mixed number if the number at the tops in the limit and there is a number at the side that represents whole number(s)

Answer:

the answer is 9 14/15

Step-by-step explanation:

Step 1 - Find Whole Number

Calculate out how many times the denominator goes into the numerator. To do that, divide 149 by 15 and keep only what is to the left of the decimal point:

149 / 15 = 9.9333 = 9

Step 2 - Find New Numerator

Multiply the answer from Step 1 by the denominator and deduct that from the original numerator.

149 - (15 x 9) = 14

Step 3 - Get Solution

Keep the original denominator and use the answers from Step 1 and Step 2 to get the answer. 149/15 as a mixed number is:

The value of the digit in the hundreds place in the number 587,349 is 1/10 the value of the digit in the thousands place in which number? *

Answers

Answer:

3000 is your answer

Step-by-step explanation:

The 3 in the hundreds place if the number 587,349 has a value of 300. This 300 is 1/10 the value of the number you're looking for, so if x is the number you're looking for, then

[tex]300 = \frac{1}{10} x[/tex]

[tex]300 \times 10 = \frac{1}{10} x \times 10[/tex]

[tex]3000 = x[/tex]

x is your answer.

15PTS PLEASE HELP ASAP!
(dont write random answers pls))

Answers

Answer:

i think the answer is (-8,-12) but i may be wrong plese correct me if  i am

Step-by-step explanation:

can you please help me with this​

Answers

Answer:

Dot plot

Step-by-step explanation:

Each dot on on 0.84 represents each plane. 5 planes had a average cruising speed of 0.84.

please help me i don’t understand how to do this

Answers

what do u need help with?

A seed company planted a floral mosaic of a national flag. The perimeter of the flag is 420 feet. Determine the​ flag's length and width if the length is 110 feet greater than the width. Use pencil and paper. Write three situations to which you could apply the resulting system of equations.
What is the length of the flag?

Answers

Answer:38

Step-by-step explanation:

Which table does NOT show y as a function of x?

Answers

Answer:

C

Step-by-step explanation:

I don’t really know what to say haha, it’s easy

SOMEONE ANWSER QUICK !

If you want to solve the system of equations below using the elimination methiod, which of the following should NOT be
your first step:

-3x + 4y = 0
2 - 2y = 8

A)Multiply every term in the bottom equation by 3.

B) Multiply every term of the bottom equation by 2.

C) Multiply every term of the bottom equation by -3.

D Multiply every term of the top equation by 2, and every term of the bottom equation by 4.

Answers

Answer:

I think that the answer would be C because you have to multiply the term at the top. This would mean you would not do C. Sorry if this is wrong. At least you have your eliminating process now. lol so doing C is out of the box, which makes C your answer.

Step-by-step explanation:

quick!! write an equation in slope intercept form using points (-3,0) (3,-4) !

Answers

Answer:

i dunno but the slope is -4/6

Step-by-step explanation:

y=-2/3x -2 this is the slips intercept form
You do y1-y2/x2-x1 and then find the rest using y=mx+b

can someone help me understand this ​

Answers

Answer:

The answer for the question is E.

I need help one this question.

Answers

Answer:

-2

Step-by-step explanation:

the y-intercept is -2

Answer:

y=2x-2

Step-by-step explanation:

Find the slope.

y1-y2/x1-x2

2-(-2)/2-0

That gives you 4/2 or a slope of 2.

The y intercept is at -2.

Y=2x-2

Which value of x makes the equation x + 7 = 21 true?
O A. 7
O B. 14
O c. 21
OD. 28

Answers

Answer:

b. 14

Step-by-step explanation:

If x to the first power is a line, and you multiply two lines together, what do you get? Think of the the exponent.

Answers

Answer: A quadratic equation (also called a parabola)

Step-by-step explanation:

A line can be written as:

f(x) = a*x + c

This is a polynomial with degree 1.

Now, of we have two lines:

f(x) = a*x + c

and:

g(x) = d*x + e

And we multiply them, we will get:

f(x)*g(x) = (a*x + c)*(d*x + e) = a*d*x^2 + a*e*x + c*d*x + c*e

We can rewrite this as:

                                           = (a*d)*x^2 + (a*e + c*d)*x + (c*e)

This is a polynomial of degree = 2, this is a quadratic equation, then if you multiply two lines together, you get a quadratic equation (or a parabola)

Answer:

ax^2+ bx + c

Step-by-step explanation:

I get a parabola, that is, an equation of the second degree

In a football stadium, 43% of the crowd cheering for Team A, and 52% of the crowd is female. 19% of the crowd is cheering for Team A and female . What is the probability that a randomly selected Person from the crowd are cheering for Team A or female?

Answers

P(TeamA) = 0,43
P(Female) = 0,52
P(TeamA and Female) = 0,19
P(TeamA or Female) = ?

P(TeamA or Female) = P(TeamA) + P(Female) - P(TeamA and Female) <=>

P(TeamA or Female) = 0,43 + 0,52 - 0,19 <=>

P(TeamA or Female) = 0,76 or 76%

PLEASE ANSWER! 15 POINTS

Answers

Answer: 13/15

Step-by-step explanation:

1/5 + 2/3 = 13/15. Since 13/15 can’t be simplified, that’s your answer.

Even if you don’t think it is an independent variable, _____ is usually always plotted on the “x” axis.


Help?

Answers

Answer:

Y axis is dependent

Step-by-step explanation:

and x axis is independent, so if its on the x axis, its alwasy a independent variable, hope it helped Lol


If a 70 kg person on a 15 kg sled is pushed with a force of 300 N, what will be person's
acceleration?

Answers


4 m/s

Explanation:
From Newton’s second Law
F = ma

a
=
F
m
=
300 N
60 kg + 15 kg
=
300 N
75 kg
=
4 m/s
2

someone please solve and find the corresponding angles thanks

Answers

the correct option is b

The obriens are buying new windows for their house. The company installs the new windows for 2100 the total cost for buying the windows and having them installed is 5323.50 of the o'briens pay 230.25 per window how many windows did they buy

Answers

Answer:

14

Step-by-step explanation:

Given that:

Cost of purchase and installation = 5323.50

Cost per window = 230.25

Cost of installation = 2100

Hence,

Total purchase cost of windows alone :

5323.50 - 2100 = 3,223.50

Therefore, the number of windows purchased is :

(Total purchase cost of windows alone / price per window)

(3,223.50 / 230.25)

= 14

Hence, 14 windows was purchased

PLEASE I NEED AN ANSWER NOW WILL MARK U BRAINLIEST!!!1!
how do u find y intercept without a graph for systems of equations? (y = x - 6)

Answers

Answer:

-6 is the y intercept.

the number added or subtracted from the x in the slope intercept form is always the y intercept

Step-by-step explanation:

plz mark me brainliest

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