Problem: Slove Each System by substitution
X=y-1
x+2y=8
x = y - 1
x + 2y = 8
x + 2y = 8
(y - 1) + 2y = 8
y - 1 + 2y = 8
3y - 1 = 8
3y - 1 + 1 = 8 + 1
3y = 9
3y/3 = 9/3
y = 3
Solve for x.
x = y - 1
x = 3 - 1
x = 2
Check.
x + 2y = 8
2 + 2(3) = 8
2 + 6 = 8
8 = 8
Answer: x = 2, y = 3