Prealgebra Functions

Consider the given function. Select all that are true.

• The function is increasing from x = -5 to x = -2

• The function is constant from x = -2 to x = 1

• The function is decreasing from x = 1 to x = 8

• The function is decreasing from x = 5 to x = -2

3x = 30

• is an example of an equation

• is an example of an expression

• is an example of a solution

• is an example of a varible

In 3x = 30, how do I solve for x?

• add each side by 3

• subtract each side by 3

• divide each side by 3

• multiply each side by 3

In 9+3x = 39, what is the first step I do to solve?

• divide each side by 3

• divide each side by 9

• add each side by 9

• subtract each side by 9

What is the definition of a coefficient?

• a statement in a combination of numbers, variables, functions (such as addition, subtraction, multiplication or division etc.) 

• a letter used to represent a number in an equation or expression

• a number multiplied by a variable

• a value that can be substituted for a variable to make an equation true

A function with a constant rate of change (slope). When graphed it is a straight line.

• Linear function

• Exponential function

• Quadratic function

• Polynomial function

Which of the following equations is equivalent to y = 3(x - 2) + 7?

• y = 3x + 1

• y = 3x - 13

• y = 3x - 1

• y = 3x + 5

Which of the following equations are linear functions? Circle ALL that apply.

• a. 2x - 3y = 6

• b. y = 2/x

• c. y = x^2 - 2

• d. y = -8 + 2/5*x

• y = -3x + 2

• y = 3x - 2

• y = -3x - 2

• y = 3x + 2

• y = \frac{1}{2}x + 3

• y = \frac{1}{2}x - 4

• y = \frac{1}{2}x - 7

• y = \frac{1}{2}x + 1