Question

Check my answers? GIving medal:

7. What is the slope of the line that passes throught the pair of points (1, 7) and (10, 1)?

a. 3/2
b. -2/3
c. -3/2
d. 2/3 <--

8. What is the slope of the line that passes through the points (-5.5, 6.1) and (-2.5, 3.1)?

a. -1
b. 1
c. -3 <--
d. d

9. what is the slope of the line that passes through the pair of points (-7/3, -3) and (-5, 5/2)?

a. 6/22 <--
b. -6/22
c. 22/6
d. -22/6

Answer 1

\(\bf \begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
&({\color{red} 1}\quad ,&{\color{blue} 7})\quad &({\color{red} {10}}\quad ,&{\color{blue} 1})\\
&({\color{red} {-5.5}}\quad ,&{\color{blue} {6.1}})\quad &({\color{red} {-2.5}}\quad ,&{\color{blue} {3.1}})\\
&({\color{red}{ -\frac{7}{3}}}\quad ,&{\color{blue} {-3}})\quad &({\color{red} {-5}}\quad ,&{\color{blue}{ \frac{5}{2}}})
\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}}\)

Answer 2

oh okay! thanks!

Answer 3

what one did he do for you

Answer 4

7 - b
8 - a
9 - -33\16