PROPORTIONAL KAHOOT:

https://play.kahoot.it/#/k/f5f48c8d-2ea4-451c-ad57-8eb0fa1c2728

SLOPE INTERCEPT FORM:

y = mx + b

m = Slope (how steep the line is)

b = the Y Intercept (where the line crosses the Y axis)\

y=mx+b graph

How do you find “m” and “b“?

b is easy: just see where the line crosses the Y axis.
m (the Slope) needs some calculation. Remember we like to write slope like a fraction.

Example 1)

y=2x+1 graph

The fastest and easiest thing to find first when looking at a graph is the y-intercept (b).

Here we see that the line crosses the y-axis at positive 1.

So, b = 1 .

Now to find the slope (m) we will use rise over run:

Rise is how far up
Run is how far along

In this example the rise is 2 and the run is 1.

So, m = 2/1 .

Now that I know m = 2/1 and b = 1 I can plug them into the equation for slope intercept form y = mx + b.

y = (2/1) x + 1

^^^^^ This is the equation of the line.
For more information on y = mx + b click here.

Practice Problems

Get your Slope Intercept on!

SLOPE

Standard

Slope is about how steep a line is.

When finding the slope from a line on a graph we use the method of rise over run .

Rise is how far up
Run is how far along

rise over runn

You can also think of it as the change in y over the change in x.

EXAMPLE #1:

The slope here is 4/6 which can simplify to 2/3.

EXAMPLE #2:

In this example the slope is 3/5.

For more information on slope click here.

Practice Problems

Get your SLOPE on!

TEST YOUR SELF ON LINES HERE!!!!

Y – INTERCEPT

Standard

Y Intercept

Where a straight line crosses the Y axis of a graph.

Example:

Y intercept

In the above diagram the line crosses the Y axis at 1.

So the Y intercept is equal to 1.

For more information on intercepts click here.