1. Write an Equation in Slope-Intercept Form

2. What is Slope-Intercept Form of an Equation?
y = mx + b
The equation includes the slope “m” and the y-intercept “b”.
This format makes it easy to graph the equation.

3. Write the equation of a line whose slope is -2 and y-intercept is (0, 3).
Start by writing y = mx + b.
Substitute “-2” for m.
Substitute “3” for b.
The equation is y = -2x + 3.

4. Write the equations of the lines that include:
Slope = 1 y-intercept = (0, -1)
Slope = 1/3 y-intercept = (0, 9)
m = 5/2 b = -6
y = x – 1
y = 1/3x + 9
y = 5/2x - 6

5. Write the Equation of a Line from a Graph
Remember to use y = mx + b.
First find where the line crosses the y-axis, that is “b.”
Next find two points and count the slope, that is “m.”
Then substitute into the formula.
Right 2
Up 4
4/2 = 2
y = 2x - 4

6. Write the Equation of a Line from a Graph
Remember to use y = mx + b.
First find where the line crosses the y-axis, that is “b.”
Next find two points and count the slope, that is “m.”
Then substitute into the formula.
Down 2
Right 3
-2/3
y = -2/3x + 2