Solve 2x=102x = 102x=10 and x+y=7x + y = 7x+y=7.
x=5,y=2x=5, y=2x=5,y=2
x=2,y=5x=2, y=5x=2,y=5
x=5,y=5x=5, y=5x=5,y=5
x=7,y=0x=7, y=0x=7,y=0