# How do I graph straight lines in Socratic?

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How can I graph straight lines in Socratic graphing utility?

By straight lines I mean functions like #y=a# and #x=a# for real values of #a# .

How can I graph straight lines in Socratic graphing utility?

By straight lines I mean functions like

##### 1 Answer

Play around with the value of the slope.

#### Explanation:

You can find an explanation of how to graph *vertical lines* in **this Socratic answer**.

The same approach can be used to graph *horizontal lines*, only this time, the slope must be a really small number. For example, you can go with

#y = 3#

by writing

y = 0.001x + 3

#" "# or simply#" "# 0.001x + 3

in the graphing utility.

graph{y = 0.001x + 3 [-10, 10, -5, 5]}

To graph

#y = -3#

you can write

y = 0.001x - 3

#" "# or simply#" "# 0.001x - 3

graph{y = 0.001x - 3 [-10, 10, -5, 5]}

Not ideal, but it gets the job done.

**ADDENDUM**

As it turns out, you can graph a horizontal line by using zero as the slope. This wasn't possible a while ago--or at least that's what I remember--but you can do it now.

So to graph

#y = -3#

you can write

y = 0x - 3

#" "# or simply#" "# 0x - 3

graph{y=0x-3 [-10, 10, -5, 5]}