Solve for both systems 9x+3y=33 and -9x + 7y = 17

9x+3y=33

9x-9x+3y=33-9x

3y=33-9x

3y/3=33-9x/3

y=11-3x

-9x + 7y = 17

-9x + 7(11-3x) = 17

-9x + 7(11) (7)(-3x) = 17

-9x + 77 -21x = 17

77 -30x = 17

77 -30x-77 = 17-77

-30x=-60

-30x/-30=-60/-30

x=2

y=11-3x

y=11-3(2)

y=11-6=5