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
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x + 10 = 18 18 - 10 = x 18 -10 = 8 x = 8
Add: 5x - y + x + y + 8 + 10 ie 6x = 18 so x = 3 and y = 7
x=-8
10
Presumably this is an equation in which the value of x is to be found. 7x+8 = 4x-10 7x-4x = -10-8 3x = -18 x = -6