Exercise 28 Page 258

Substitute some arbitrary values for x to find their corresponding y-values.

Practice makes perfect

One way to graph a function rule is by making a table of values and substituting some arbitrary values for x. Doing so will give the corresponding values of y, which we can use to form ( x, y) coordinate pairs.

x	3x^3	y	(x,y)
-2	3( -2)^3	-24	( -2, -24)
-1	3( -1)^3	-3	( -1, -3)
0	3( 0)^3	0	( 0, 0)
1	3( 1)^3	3	( 1, 3)
2	3( 2)^3	24	( 2, 24)

Let's plot these points on a coordinate plane.

By connecting all of our points, we form the graph of the function rule. Because there is a variable with an exponent in the function, our line will not be straight. Later, we will learn that this type of function is called a cubic function.

Subchapter links

Lesson Check p.257

Practice and Problem-Solving Exercises p.257-259

Standardized Test Prep p.259

Mixed Review p.259

Exercise 28 Page 258

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