Question

Solve the system of equations by substitution.
x+y=18
y=8x

Answer 1

2

Explanation:

x + y = 18

y = 8x

x + 8x = 18

9x = 18

x = 18÷9

x = 2

Answer 2

x=2, y=16

Explanation:

x+y=18

y=8x

x+8x=18

x=2

y=16