Equation of a straight line part two

We can examine the second defining property of by looking at the same table below.

	-1	0	1	2	3	4
	-1	1	3	5	7	9

As the value of increases by 1, the value of increases by 2. When is 0, is 1. When increases to 1, is 3 and when increases to 2, is 5. We can see that increases by 2 when increases by 1. This is called the step-size. The step-size of the equation of the straight line is 2.

Let’s find the step-size of other equations of a straight line.

	0	1	2	3
	2	7	12	17

As increases from 0 to 1 to 2, increases from 2 by 5 to 7 and then to 12. The step-size of is 5.

Let’s look at one more.

	0	1	2	3
	2	-5	-12	-19

As increases from 0 to 1 to 2, decreases from 2 to -5 to -12. The step-size of is -7.

The step-size is the number that comes in front of the in an equation of a straight line.

Let’s look at a table of the step-size for some equations of a straight line.

Equation	Value of the step-size
	5
	5
	-7
	-7
	10