algebra
posted by Christina on .
Solve by using the elimination method.
9xy=72
x+4y=45

9xy=72
x+4y=45
get either x to be same value or y... in this case i chose y
4(9xy=72)
x+4y=45
so
36x4y=288
x+4y=45
so
37x=333
x= 9
then plug 9 into one of the equation to get y.