Question

Paul says the slope of the line is zero

Phoebe says the slope of the line is undefined

A. Paul
B. Phoebe

Why did you use that answer?

Answer 1

Answer:

B. Phoebe

Step-by-step explanation:

Let's find the slope of the line that passes through (12, 5) and (12, 9).

Slope = $\frac{y_2 - y_1}{x_2 - x_1} = \frac{9 - 5}{12 - 12} = \frac{4}{0}$ = undefined.

14 can't be divided by zero. Therefore, it is concluded that the slope of the line is undefined.

Therefore, Phoebe is correct.