Question 311766
The sum of two numbers is 59
x + y = 59
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The larger number is 15 more than the smaller number.
y = x + 15 
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What are the numbers? 
:
Replace y with (x+15) in the 1st equation
x + (x+15) = 59
2x = 59 - 15
2x = 44
x = 22
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You can find the value of y