Math! I really need help!
posted by Marie .
20y=17.5x
How can I find x and y

There is no unique solution for x and y
pick any x, say x=1
then 20y = 17.5(1)
y = 17.5/20 = .875
so one such solution is (1 , 0.875)
using the above method you can find as many solutions as you like.