Question
Use the definition of decreasing to prove that the function $f(x)=1-3 x$ is decreasing on $(-\infty, \infty)$.
Step 1
A function $f(x)$ is decreasing on an interval if for any two numbers $x_1$ and $x_2$ in the interval, if $x_1 < x_2$, then $f(x_1) > f(x_2)$. Show more…
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