X=y-1

X+2y=8

Solve each system by substituation

The answer is

y=3

x=2

Also, substitution is just a type of method to solve for x and y.

Tell me if you want the steps for solving it

Since the first equation is already set up as x = use it to plug into the second equation.

x + 2y = 8

(y - 1) + 2y = 8

y - 1 + 2y = 8

3y - 1 = 8

Add 1 to both sides

3y = 9

Divide both sides by 3

y = 3

Use x = y - 1 to solve for x

x = 3 - 1

x = 2

(2,3)