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Pearson Algebra 1 Common Core, 2011

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Pearson Algebra 1 Common Core, 2011 View details

5. Standard Form

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Exercise 49 Page 327

Can you enter the equation as it is currently written?

Graphing Calculator:

Sketch:

Practice makes perfect

To graph the equation, we first have to write it in slope-intercept form by solving for y.

3x+3y=-15

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Write in slope-intercept form

LHS-3x=RHS-3x

3y=- 3x-15

.LHS /3.=.RHS /3.

y=- 3x/3-15/3

Calculate quotient

y=- x-5

Having rewritten the equation, we can enter it in our calculator by pressing the Y= button and typing the function in one of the rows. When the equation has been entered in the calculator, we can push GRAPH to draw it.

To have a better look we will change the size of the window by pressing WINDOW and changing the settings.

From the graph we see that the equation intercepts the x-axis at (- 5,0) and the y-axis at (0,- 5). Since we only need two points to graph a linear equation, we can plot the graph using the intercepts.

Subchapter links

Lesson Check p.325

Practice and Problem-Solving Exercises p.326-328

Standardized Test Prep p.328

Mixed Review p.328