Question 185082
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Son's age now:  <i>s</i>, and 7 years ago: <i>s</i> - 7, and 7 years from now: <i>s</i> + 7.


Father's age now: <i>f</i>, and 7 years ago: <i>f</i> - 7, and 7 years from now: <i>f</i> + 7.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  f - 7 = 3(s - 7)]


and


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  f + 7 = 2(s + 7)]


Put the equations into standard form, i.e. *[tex \Large Af + Bs = C] or slope intercept form, i.e., *[tex \Large  f = ms + b] and then solve the system either by elimination or substitution.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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