Solve 4x + 3y = 23 and x + 3y = 8

x + 3y = 8

x + 3y-3y = 8-3y

x=8-3y

4x + 3y = 23

4(8-3y) + 3y = 23

4(8) (4)(-3y) + 3y = 23

32-12y+3y=23

32-9y=23

32-9y-32=23-32

-9y=-9

-9y/-9=-9/-9

y=1