2x + 5y = 7
2x - 3y = 15

1. 2x + 5y = 7

2. 3x + 6y = 3

Multiply Equation 1. by -3 and Equation 2. by 2:

1'.  -6x - 15y = -21

2'.  6x + 12y = 6

Add Equations 1' and 2' to eliminate x

y(-15 + 12) = (-21 + 6)

-3y = -15

y = 5

Substitute this value of y into either Equation 1 or 2 and solve for x:

1. 2x + 5y = 7 ⇒ 2x + 5(5) = 7

2x = (7 - 25) = -18

x = -9

Check

Does 3(-9) + 6(5) = 3?

Does -27 + 30 = 3?

YES!!

Step-by-step explanation:

what "following statement"?

step-by-step explanation:

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.