SOLUTION: seven years ago, my son was one third my age at the time. seven years from now, he will be one half my age at that time. How old is my son?
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Question 185082: seven years ago, my son was one third my age at the time. seven years from now, he will be one half my age at that time. How old is my son?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Son's age now: s, and 7 years ago: s - 7, and 7 years from now: s + 7.
Father's age now: f, and 7 years ago: f - 7, and 7 years from now: f + 7.
)
and
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Put the equations into standard form, i.e. 
or slope intercept form, i.e., 
and then solve the system either by elimination or substitution.
John
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