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)\
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)
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
- Rise is how far up
- Run is how far along



For more information on slope click here.
Practice Problems
Y – INTERCEPT
Standard
Y Intercept
Where a straight line crosses the Y axis of a graph.
Example:
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.
Practice Problems
Slope Intercept Form:
http://www.mathsisfun.com/equation_of_line.html
Standard Form of a Linear Equation:
The “Standard Form” for writing down a Linear Equation is
Ax + By = C
A shouldn’t be negative, A and B shouldn’t both be zero, and A, B and C should be integers.
Example: Put this in Standard Form:
y = 3x + 2
Bring 3x to the left:
-3x + y = 2
Multiply all by -1:
3x – y = -2
Note: A=3, B=-1, C=-2
This form:
Ax + By + C = 0
is sometimes called “Standard Form”, but is more properly called the “General Form”.
ALGEBRA REVIEW KAHOOT:
https://play.kahoot.it/#/?quizId=8af8cbf5-78da-4760-8b40-ccc70cd54a6e
Slope Kahoot:
https://play.kahoot.it/#/k/31ab2ba7-803c-45a4-b504-ccc96ce3ea17
Y-Intercept Kahoot:
https://play.kahoot.it/#/k/e4aa37b7-7aac-4f4c-9d8c-4fe790b1c78d