y=1-3/5x solve for x being 0,1,and 2

3/5x is not defined for x=0

1 - 3/5 = 2/5
1 - 3/10 = 7/10

If you meant

y = 1 - (3/5) x
then just plug in the values:
1 - (3/5)(0) = 1
1 - (3/5)(1) = 2/5
1 - (3/5)(2) = -1/5