The graph of the linear function $f$ has intercepts at

$(a, 0)$ and $(0, b)$ in the $x y$-plane. If $a+b=0$ and

$a \neq b,$ which of the following is true about the slope

of the graph of $f ?$

\begin{equation}\begin{array}{l}{\text { A) It is positive. }} \\ {\text { B) It is negative. }} \\ {\text { C) It equals zero. }} \\ {\text { D) It is undefined. }}\end{array}\end{equation}

## Discussion

## Video Transcript

And so for this one, we want to know the percent increase in the water bill. Well, if we're dealing with the percent in Greece, we know that's some kind of a percent change, and we can use the equation final minus initial over initial. So that was going plugging. And well, now it's this and it was this. So this is our initial and this is our final. So then we can plug in seventy nine point eight six, minus seventy five point seven four, divided by seventy five point seven four. So then seventy nine point seven point are seventy nine four eight six one a seventy five point seven four is four point one to We just want to divide that by seventy five point seven four and that gives us about zero point zero five four, which means that the increase was by five point four percent. Because we just move the decimal places over by two to the right in order to get from that small too present. So d

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