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 said to be decreasing on an interval $I$ if for any two numbers $a$ and $b$ in $I$, if $a < b$ then $f(a) > f(b)$. Show more…
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