# How do you graph the line #y=2x+2#?

##### 1 Answer

See explanation

#### Explanation:

The minimum number of points needed to draw a strait line graph is 2. However, 3 is better as one of them forms a check. They should all line up. If not then something is wrong.

Lets determine 2 points

The line will 'cross' the y axis at

So we can determine these points (intercepts) by substitution.

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For y-intercept set

So y-intercept is at the point

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For x-intercept set

Subtract

Divide both sides by

But

So the y-intercept is at the point

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Mark and label these two points then draw you line through them. Take the line to the edges of the graphing area on the paper.

Do not forget to label your graph.

In an exam you get extra marks for labelling you points and giving a title to your graph.