CPM Homework Help : CCA Problem 2-71

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Home > CCA > Chapter Ch2 > Lesson 2.2.3 > Problem 2-71

2-71.

Find the slope of the line passing through each pair of points below.

Hint:
One possible option is to plot the points, make a line connecting them, and make a slope triangle to find the rise over the run.
More Help:
A second possible way is to subtract the $y$ 's and then subtract the $x$ 's.

$(1,2)$ and $(4,-1)$
Steps (a):
$\frac{2-(-1)}{1-4}=\frac{3}{-3}=-1$
The slope of part (a) is $-1$

$(7,3)$ and $(5,4)$

$(-6,8)$ and $(-8,5)$

$(55,67)$ and $(50,68)$

Azizah got $1$ for the slope of the line through points $(1,2)$ and $(4,-1)$ . Explain to her the mistake she made and how to find the slope correctly.
Additional Hint:
Solve using one of the two methods above, and compare your answer to the slope that Azizah found.

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