Question

A student found the slope of a line that passes through the points (3, 15) and (5, 9) to be-1/3 . What mistake did he make?

A. He did not make a mistake. That is the correct slope.
B. He used the negative reciprocal of the slope.
C. He added a negative sign.
D. He used the reciprocal of the slope.

Answer 1

someone please help!

Answer 2

ok so do you know point-slope formula

Answer 3

no?

Answer 4

welll, what's the sloppe it anyway?

\(\bf \begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
&({\color{red}{ 3}}\quad ,&{\color{blue}{ 15}})\quad &({\color{red}{ 5}}\quad ,&{\color{blue}{ 9}})
\end{array}
\\\quad \\

slope = {\color{green}{ m}}= \cfrac{rise}{run} \implies \cfrac{{\color{blue}{ y_2}}-{\color{blue}{ y_1}}}{{\color{red}{ x_2}}-{\color{red}{ x_1}}}\)

what would that give you for the slope?

Answer 5

listen to @jdoe0001 i got it mixed up

Answer 6

@Tallan just substitute and solve