Plug the second equation into the first equation.
2x+3(x-1)=12
Multiply everything in the parenthesis by 3.
2x + 3x - 3 = 12
Combine like terms.
5x - 3 = 12
Add 3 to both sides.
5x = 15
Divide 5 on both sides.
x = 3
Put this into the second equation.
y = 3 - 1
y = 2
Your solution is (3,2)
Hope this helps!
