3x+4y=12 solve for solution (0.)(.3/4) (,0) (8/3,)

You are given the equation, and the x,y set. Iwill be happy to critique your work. Here is one as an example:

3x+4y=12 solve for solution (.3/4)
3x + 4(3/4)=12
3x + 3=12
3x=9
x=3