Question

8x - 2y + -70
2x + 15 = y

How do you solve this system of equations?

Answer 1

rearrange one eqation so you have a single variable on one side and sutitiute it into the other one

Answer 2

substitution is easy in this case

Answer 3

first step is getting the equations entered correctly

Answer 4

y=15+2x
substitute y in 1st equation

Answer 5

y=2x+15 now input it into the other equation:
8x - 2(2x+15) = 70
8x -4x +30 = 70
4x=40
x=10 Now use this for the original equation to get y
y = 2(10)+15 = 35

x=10, y=35

Answer 6

Since you know what y is, jus plug it into the first equation.
8x - 2y + -70
8x - 2(2x + 15) + -70
Solve, and then you have your answer for x. When you get x, just go back and find y.