Question 666553
Establish variables
x = father
y = son
...
Given
x = 5y
x = 2y + 15
...
Plug in the value of x into the second equation
5y = 2y + 15
Group like terms
5y - 2y = 15
3y = 15
y = 5
...
If son is 5, then father, x is 5(5) = 25
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