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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 = m x + b

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Presentation Transcript
review
Review
  • What are two ways you find the slope of a line?
    • Slope formula
    • Plotting points and finding the rise and run between points
slope intercept form
Slope-Intercept Form
  • y = mx + b

When the equation is in this form, you can identify the slope (m) and the y-intercept (b).

y-intercept

slope

examples
Examples
  • Identify the slope and y-intercept

m = 3

b = 4

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:

-Add/Subtract your x value

-Multiply/Divide both sides of the equation by the coefficient of y

do these examples on your own paper
Do these examples on your own paper

slope

y-intercept

slope

y-intercept

m = 1

b = -4

m = -¼

b =

graph the equation 2x y 3
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

Quiz time!!!!

Take everything off your desk and get ready for the quiz!