Question

Please see my equations below. Could someone check them for me and let me know if they are correct and what I did wrong.

Select any two integers between -12 and +12 which will become solutions to a system of two equations.
Write two equations that have your two integers as solutions. Show how you built the equations using your integers.
Solve your system of equations by the addition/subtraction method.

The solutions are 12 and 6
addition equation:
x-3=3
x-6+0=3+3
x+0=6
x+6
check:
x-0=6
6-0=6
6=6
subtraction method:
x + 6=12
x +6-6=12-6
x+0=6
x=6
check:
x + 6= 12
6+6=12
12=12