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Pearson Algebra 2 Common Core, 2011 View details

3. Linear Functions and Slope-Intercept Form

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Exercise 33 Page 78

What information does a slope-intercept form equation give you?

Practice makes perfect

Equations written in slope-intercept form follow a specific format. y=mx+ b In this form, m represents the slope of the line and b represents the y-intercept.

Identifying Slope and Intercept

Since the given equation is not in slope-intercept form, let's rewrite it so that it will be easier to identify the slope and y-intercept.

-2x+5y=-10

AddEqn

LHS+2x=RHS+2x

5y=2x-10

DivEqn

.LHS /5.=.RHS /5.

y=2/5x-2

Below we highlight the slope m and y-intercept b. y=2/5x - 2 ⇔ y=2/5x+( -2) The slope is 25. The y-intercept is -2, so the graph crosses the y-axis at the point (0, -2).

Graphing the Equation

A slope of 25 means that for every 5 units we move in the positive horizontal direction, we move 2 units in the positive vertical direction. m=2/5 ⇔ rise/run=2/5 To graph the equation, plot the y-intercept and then use the slope to find another point on the line.

Subchapter links

Lesson Check p.78

Practice and Problem-Solving Exercises p.78-80

Standardized Test Prep p.80

Mixed Review p.80

Exercise 33 Page 78

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Identifying Slope and Intercept

Graphing the Equation