Question

Solve using double substitution

y=x-7
y=-2x+8

Answer 1

(5, -2)

Explanation:

x - 7 = -2x + 8

add 2x to both sides

x - 7 + 2x = -2x + 8 + 2x

3x - 7 = 8

Add 7 to both sides

3x - 7 + 7 = 8 + 7

3x = 15

3x = 15

x = 5

y = 5 - 7

y = -2

Solution (5, -2)