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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-2+4=-8 x+2=-8 x=-10
If x equals 10 and y equals 10, then 9x plus 8y equals 170.
7x + 8 = 10x - 2 ∴ 3x = 10 ∴ x = 10/3
3+10 = 13