# How do you graph #y=4x-1# by plotting points?

##### 1 Answer

See explanation

#### Explanation:

For a strait line graph you technically only need two points. It is better to have 3 or more. I would suggest 3. The logic behind this is that if all the points do not line up when you draw a line through them then you have a wrong calculation some ware.

You may chose to determine what is called critical points and use those (just 2) or you may chose substituting values for

Calculation Point 1

Let

Calculation Point 2

Let

You always read left to right on the x-axis. Sometimes the reverse order is given in questions setting 'a trap'.

ALWAYS READ LEFT TO RIGHT ON THE X-AXIS FOR WHEN Y IS THE ANSWER

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You either need a given point or the equation.

Given equation:

The x-axis crosses the y-axis at

The y-axis crosses the x-axis at

Set #x=0" : " y=4x-1" "->" "y=4(0)-1 " "->" "y=-1

So we now have the point:

Set

So we now have a second point: