# Is the line with equation y = -8 horizontal or vertical?

##### 1 Answer

Aug 14, 2015

Horizontal.

#### Explanation:

Think of what you've got here.

You know that the equation of a line in slope-intercept form is

#color(blue)(y = mx + b)# , where

Now, the equation for your line looks like this

#y = -8#

Notice that it's missing the **slope** of the line must be equal to **zero**.

What this tells you is that for **any value** of

Therefore, the line described by the equation

graph{y + 8 = 0.001x [-13.17, 12.15, -11.11, 1.54]}