Today we are going to look at slope intercept form of a line.

What form is that in y = mx + b ?

m = slope of the line

b = y intercept

What is a y intercept?

It is the point in which the y crosses the x axis.

My y axis is the long axis, I remember it because y is a long letter.

This intercept is 1,2, 3 and I have a y intercept of positive 3.

What is my slope?

I pick two points on the line and I count.

I will go down 3 and over 2.

Basically you draw a right triangle, and we count 1,2,3 down and 1,2 across.

It will be 3/2.

It is slopping down so it will be a negative 3/2

Finally, we just plug and m and a b into our equation.

I will go back over here and for my slope I will plug in negative 3/2

For my y intercept I will put in y intercept I will plug in 3.

There you go, you have your y intercept equation from a graph.

Let's look at an overview

y=mx+b

m = slope

b = y intercept

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