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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If x equals 10 and y equals 10, then 9x plus 8y equals 170.
Ten.Five plus five equals ten. Written in numbers, that is: 5+5=10
3+10 = 13
10
It is an equation and the value of x works out as 88