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# Slope (Gradient) of a Straight Line

The Slope (also called Gradient) of a straight line shows how steep a straight line is.

The method to calculate the Slope is:

Slope  =
 Change in Y Change in X The Slope of the above line =
 3 3
=  1

The Slope of the above line is equal to 1

## Different Types

There are different types of slopes of a straight line. Below are listed most of the ones that you will come up against.

Remember:

• Starting from the left end of the line going across to the right is positive (but going across to the left is negative).
• Up is positive, and down is negative slope =
 3 5
=  0.6 slope =
 4 2
=  2 slope =
 -4 2
= –2

(That line goes down as you move along, so it has a negative gradient.) slope =
 0 5
=  0

(A line that goes straight across has a slope of zero.) slope =
 3 0
= undefined

That last one is a bit tricky ... you can't divide by zero, so a "straight up and down" line's slope is "undefined".