Question

Question 15 of 25 Which of the lines below has a slope of zero? A В C D 6 O A. Line A B. Line B C. Line C D. Line D

Answer 1

Slope of line is:

`m=(y_2-y_1)/(x_2-x_1)`

(A)

for graph (A) x is constent that mean:

`x_2=x_1`

so first line slope is infinty .

(B)

Forgraph B y is constent so:

`y_2=y_1`

then slope is:

`\begin{gathered} m=(y_2-y_1)/(x_2-x_1) \\ y_2=y_1 \\ m=0 \end{gathered}`

Slope of line is zero.

(C)

For graph (C)

`\begin{gathered} m=(y_2-y_1)/(x_2-x_1)_{} \\ y_1>y_2 \end{gathered}`

So slope is negative ( that mean line slope is below zero.)