Solve for 2a+2x=18 and a+3x = 17

a+3x = 17

a+3x-3x = 17-3x

a= 17-3x

2a+2x=18

2(17-3x)+2x=18

(2)(17) (2)(-3x)+2x=18

34-6x+2x=18

34-4x=18

34-4x-34=18-34

-4x=-16

-4x/-4=-16/-4

x=4

a= 17-3x

a= 17-3(4)

a= 17-12=5