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Mary's is twice as old as her nephew. The sum of their ages is 108. Write a system of
equations that could be used to find x, Mary's age and y, the nephew's age.
y = 2x
x + y = 108
x = 2y
x + y = 108
x = y +2
* +y = 108
y = x + 2
y = 108 – 2