Solve for x and y
y=1/3x - 1
x-y=-1
y = ( 1 / 3 ) x - 1
x - [ ( 1 / 3 ) x - 1 ] = - 1
x - ( 1 / 3 ) x + 1 = - 1
( 3 / 3 ) x - ( 1 / 3 ) x = - 1 - 1
( 2 / 3 ) x = - 2 Multiply both sides with 3
2 x = - 2 * 3
2 x = - 6 Divide both sides with 2
x = - 6 / 2
x = - 3
x - y = - 1
- 3 - y = - 1
- 3 + 1 = y
y = - 2