Question

What is the solution of the system use substitution. 8x-2y=10 y=3x-9

Answer 1

x = -4

y = -21

Explanation:

・8x - 2y = 10

・y = 3x - 9

・find x!

8x - 2(3x - 9) = 10

8x - 6x + 18 = 10

2x = - 8

・x = -4

・now that we've x, find y by substituting again

y = 3x - 9

y = 3(-4) - 9

y = -12 - 9

・y = -21