Intercepts
Find the x intercept of
x + y = 8
8
Standard Form of a line
Ax + By = C
Where A and B are not both 0.
The line rises from left to right
Positive slope
5 +2x = 13
x = 8
Find the y intercept of
3x + 6y = 18
3
Slope of a line
Rise / Run
The line falls from left to right
Negative slope
3x + 5 = x - 11
x = -8
Find the x and y intercepts of
-6x + 9y = -18
x intercept is 3
y intercept is -2
Rise
The change in y values.
The line is horizontal
Slope of 0
5(3x + 4) = 5x
x = -2
Does this line go through the origin?
4x + 6y = 12
No
Slope Intercept form
y = mx + b
The line is vertical
Undefined slope
10(2y + 2) - 6y = - 8
y = - 2