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17(15-y)+20y= 290
x=15-y
255-17y+20y=290
x=15-y
3y=290-255
x=15-y
3y=35/:3
x=15-y
y=11i 2/3
x=15-11 2/3
x=10/3= 3i 1/3
17x+20y=290
y=15-x
17x+20(15-x)=290
y=15-x
17x+300-20x=290
y=15-x
17x-20x=290-300
y=15-x
-3x=-10
y=15-x
x=3 1/3
y=15- 3 1/3
x=3
y=11 2/3
x=3