What's substitution for x=y-7; x+8y=2

X=2-8y

y=x+7

y=2-8y+7

9y=2+7

9y=9

y=1

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

Step: Solve x = y-7 for x: Step: Substitute y-7 for x in x + 8y = 2:

x + 8y

=2 y-7 + 8y = 2

9y - 7 = 2 (Simplify both sides of the equation)

9y - 7 + 7 = 2+7 (Add 7 to both sides) 9y = 9

9y / 9 = 9/9 (Divide both sides by 9)

y=1

Step: Substitute 1 for y in x = y-7 : x = y-7

x = 1-7

x = - 6 (Simplify both sides of the equation)

Answer: x = - 6 and y = 1