# Graph using Slope-Intercept Form

Document Sample

```					Graph using Slope-
Intercept Form
Review
   What are two ways you find the slope of a
line?
   Slope formula

   Plotting points and finding the rise and run
between points
Now let’s see another way to
graph a line
Slope-Intercept Form
   y = mx + b

slope      y-intercept

When the equation is in this form, you can
identify the slope (m) and the y-intercept (b).
Examples
    Identify the slope and y-intercept
y  3x  4              m=3
b= 4

3x  y  2              m = -3
b=2

If the equation is not setup like y = mx + b, then you must
manipulate the equation to that format. The general steps
include:
-Multiply/Divide both sides of the equation by the coefficient of y
Do these examples on your
own paper
3x  3 y  12          x  4y  6

slope   y-intercept   slope    y-intercept
m=1      b = -4       m = -¼   b=   3
2
Graph the equation 2x + y = 3
Step 1: Rewrite the equation in slope-intercept form

y = -2x + 3
Step 2: Identify the slope and the y-intercept
m = -2            b=3

Step 3: Plot the point that corresponds to the y-intercept
y-intercept - (0,3)

Step 4: Use the slope to locate a second point on the line.
Draw a line through the two points.
Quiz time!!!!
Take everything off your desk and