Question

Finding slope of horizontal and vertical lines of the first question

Answer 1

We are given the following two points

`(-4,9)\; and\; (4,9)`

Notice that the y-coordinates are the same meaning that it is a horizontal line.

Let us find the slope of the line passing through these points

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

Substitute the given points into the above formula

`m=(y_2-y_1)/(x_2-x_1)=(9-9)/(4-(-4))=(0)/(4+4)=0`

As you can see, the slope of a horizontal line is always 0.

Now, consider the following two points