Equation 1) 2x + 3y = 40
Equation 2) -2x + 2y = 20
Add equations together.
5y = 60
Divide both sides by 5.
y = 12
Plug in 12 for y in the first equation.
2x + 3y = 40
2x + 3(12) = 40
Simplify.
2x + 36 = 40
Subtract 36 from both sides.
2x = 40 - 36
Simplify.
2x = 4
Divide both sides by 2.
x = 2
x = 2, y = 12
~Hope I helped!~