Exercise 20 Page 153

We can calculate the slope by substituting the given points into the Slope Formula.

m = \frac{y _{2} - y _{1}}{x _{2} - x _{1}}

Note that it does not matter which point we choose to use for

(x_{1}, y_{1})

and

(x_{2}, y_{2}),

since the result of using the Slope Formula will be the same.

m = \frac{y _{2} - y _{1}}{x _{2} - x _{1}}

Substitute $(- 3, 6)$ & $(2, 6)$

m = \frac{6 - 6}{2 - ( - 3 )}

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Add and subtract terms

$a - (- b) = a + b$

m = \frac{6 - 6}{2 + 3}

Add and subtract terms

m = \frac{0}{5}

$\frac{0}{a} = 0$

m = 0

The slope of the line that passes through the given points is

0 .