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Sagot :
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
combine the terms
x + x = 25 - 9
2x = 16
x = 8
substitute the value for x in equation 2
y = x + 9
y = 8 + 9
y = 17
'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
combine the terms
x + x = 25 - 9
2x = 16
x = 8
substitute the value for x in equation 2
y = x + 9
y = 8 + 9
y = 17
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
combine the terms
x + x = 25 - 9
2x = 16
x = 8
substitute the value for x in equation 2
y = x + 9
y = 8 + 9
y = 17
'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
combine the terms
x + x = 25 - 9
2x = 16
x = 8
substitute the value for x in equation 2
y = x + 9
y = 8 + 9
y = 17
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