Indeterminate. Both x and y could have an infinite set of values.
(1, 9)
x = 2y = 4
x=4 y=4
x = 8 and y = 0
8
x=5 y=-3
x=1 y=7
x = 3 and y = 5
x + y = 10 y = x + 8 so, x + (x + 8) = 10 2x + 8 = 10 2x + 8 - 8 = 10 - 8 2x = 2 x = 1 and y = 9 because y = x + 8 y = 1 + 8 y = 9
(3, 5)
x + y = 10 y = x + 8 so, x + (x + 8) = 10 2x + 8 = 10 2x + 8 - 8 = 10 - 8 2x = 2 x = 1 and y = 9 because y = x + 8 y = 1 + 8 y = 9
x = 11/7 and y = 12/7