The function $f(x)$ satisfies
\[f(xy) = xf(y)\]for all real numbers $x$ and $y.$  If $f(1) = 25,$ find $f(79).$
Question:
The function $f(x)$ satisfies
\[f(xy) = xf(y)\]for all real numbers $x$ and $y.$  If $f(1) = 25,$ find $f(79).$
Answer:
Let's think step by step.

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1975
The function $f(x)$ satisfies
\[f(xy) = xf(y)\]for all real numbers $x$ and $y.$  If $f(1) = 25,$ find $f(79).$
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