plz help
Solve the system by Substitution

y=2x+15

7x+2y=−14


A(-6, 3)

B(4, -7)

C(6, -7)

D(-4, 7)

Answers

Answer 1

Answer

D

Step-by-step explanation:

y=2x+15

7=2(-4)+15

7=15-8

7=7

7x+2y=-14

7(-4)+2(7)=-14

-28+14=-14

-14=-14


Related Questions

For shipping packages, UPS charges $7.00 for the first pound, and $0.20 for each additional pound. FedEx charges $5.00 for the first pound and $0.30 for each additional pound. How many pounds will it take for UPS and FedEx to cost the same? Using p for the number of pounds, write and solve and equation to represent this situation.

Answers

Answer:

x=20

Step-by-step explanation:

7+0.20x=5+0.30x              

then take the 7 and subtracet the 2 from it, then take the 0.30 and subtract the 0.20 from it then you should get 2=0.10x      

then to get rid of the 0.10 you take it and divide it from the 2 which gives you 20 then you have 20=x and thats your answer

3Hg(NO3)2
Please help me with this

Answers

Answer:

whats the question

Step-by-step explanation

what do i gotta do??

Given the formula y = mx + b, what is the slope of a line, m, if x = 5, y = 7, and b =10?
A. The slope 3/5 ·
B. The slope 5/3 ·
C. The slope - 3/5 ·
D. The slope - 5/3 ·

Answers

The answer is:
C. The slope -3/5
Because -3/5 times 5 is -3 and when you combine -3 and 10 the answer is 7 and 7=7 (the y)

-6=8x-14 show all steps please

Answers

Answer:

1=x

Step-by-step explanation

Add 14 to both side(because it is opposite)

-6=8x-14

+14       +14

8=8x

Divide both sides by 8

8/8=8x/8

1=1x(or just 1=x)

The answer will be X=1.

What is the distance between the points 4 and -5 on a number line?

Answers

Answer:

9

4--3--2--1--0--1--2--3--4--5

Positive        Negative

Step-by-step explanation:

Write the statement below as a math expression



twice the difference of a number and eight

A.
2n+8

B.
2n-8

C.
2(n+8)

D.
2(n-8)

Answers

D. 2(n-8)

The difference of a number and eight is separate from being multiplied by 2 which is why you would use parenthesis.

Write an expression in standard form for
the area of the rectangle.
4x - 1
+
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Answers

Answer:

6x +4

Step-by-step explanation:

add or subtract like terms

Glen got 48 out of 64 correct in his test.
What fraction of the marks did he get correct?
Give your answer in its simplest form​

Answers

Answer:

48/64

Because 48 out of 64

Answer:

3/4 of the marks he got correct

Find the exact value of Cosine (alpha + beta) given sin Alpha = two-fifths for Alpha in Quadrant II and Cosine Beta = one-third for Beta in Quadrant IV.

Answers

The exact value of cos (α + β) is (4√2-21) / 15.

What is angle?

An angle is the formed when two straight lines meet at one point, it is denoted by θ.

Given that,

Sin α = 2/5, and α is in second quadrant,

cos β = 1/3 , and β is in fourth quadrant

Since, α is in second quadrant, the value of cos α will be negative.

The value of cos α, by right angle triangle property,

cos α = -√21 / 5  

Since, β is in the fourth quadrant, the value of  sin β will be negative.

The value of sin β  = -  2√2 / 3

Cos (α + β) = cos α.cos β - sin α. sin β

Substitute the values here,

Cos (α + β) = (-√21 / 5)  . 1/3 - 2/5. ( -  2√2 / 3)

                   = -21/15 + 4√2/15

                   =  (4√2-21) / 15

The value of cos (α + β) is (4√2-21) / 15.

To learn more about Angle on:

https://brainly.com/question/28451077

#SPJ2

Answer:

D

Step-by-step explanation:

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Answers

Answer:

y=mx+b

Step-by-step explanation:

Answer:

y=mx+b

Explanation:

The slope-intercept formula is y=mx+b. The b represents the y-intercept, which is the point where a line on a graph meets the y-axis. The coordinates for this would be (0,b). The m represents the slope, which is the rate of change. The x represents any x variable that you plug in. The y represents the y variable.

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Answers

Answer:

The answer is 7.

Step-by-step explanation:

5 + 2 = 7

I hope this helps! If it did, please consider rating and pressing thanks! Have a good day.

Answer:

7

Step-by-step explanation:

describe fully the single transformation which takes shape A to shape B

Answers

Answer:

You need to show us the shapes first bro

Step-by-step explanation:

Please help me answer and understand this question, im really confused and don't know what to do​

Answers

Answer:

what the hell is this question

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Answers

I think it’s the first one

After 10 minutes a place was 75 miles
from Chicago, after 17 minutes it was
138 miles from Chicago. What is the
plane's average speed (miles per min)?

Answers

75 divide by 10 which is 7.5 so the average speed is 7.5. Proof 7.5 times 10 is 75

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Answers

Answer:

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Step-by-step explanation:

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Answers

So first of all you count all the blocks, so it will be 16 blocks (4x4) sideways and horizontal.

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Answers

Answer:

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Step-by-step explanation:

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have a good day lovely :)

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Answer:

Step-by-step explanation:

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Rashads teacher buys paperback books for her classroom library. Each book costs $6, and she spends a total of
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Answers

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Step-by-step explanation:

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Answers

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Step-by-step explanation:

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Answers

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Step-by-step explanation:

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Step-by-step explanation:

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Step-by-step explanation:

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Step-by-step explanation:

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