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Math·Algebra·Linear functions

easy

For the linear function $f$, the graph of $y=f(x)$ in the xy-plane has a slope of $25$ and passes through the point $(0,0)$. Which equation defines $f$?

A

$f(x)=-\frac{1}{25}x$

B

$f(x)=-25x$

C

$f(x)=\frac{1}{25}x$

D

$f(x)=25x$