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the sum of two number is 25. one of the number exceeds the other by 9. find the number.

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Shinalcantaraviz
let 'x' be the number
     'y' be the other number
x + y = 25  ----equation 1
y = x + 9  -----equation 2
substitute equation 2 to equation 1
x + x + 9 = 25
2x + 9 = 25
2x = 25 - 9
2x = 16
x = 8
substitute x=8 to equation 2
y = x + 9
y = 8 + 9
y = 17