Fundamentals of Math

Fundamentals of Mathematics

You will notice that this line touches both the and -axis. Whenever a line touches the -axis, the point where it touches is known as the -intercept . Notice that all along the -axis, the -value is always zero. Meaning -intercepts are always written in the form of ( , 0). Similarly, whenever a line touches the y -axis, the point where it touches is known as the -intercept . Notice that all along the -axis, the -value is always zero. Meaning -intercepts are always written in the form of (0, ) .

Practice 4.1.2

Directions: Identify the x and y-intercepts of each equation below.

1.

2.

3.

-intercept: ____________

-intercept: ____________

-intercept: ____________

-intercept: ____________

-intercept: ____________

-intercept: ____________

Answer Key on Page 120

4.2 Graphing Linear and Quadratic Functions We can explore these representations using the following example; CellularWorld charges customers $15.00 per month plus 25 cents per minute. So, if a customer talks for 1 minute, they owe $15.25 for the month, 2 minutes $15.50, 3 minutes $15.75, etc. This relationship can be expressed via a table.

Minutes Used ( ) Total Cost ( ) 0 minutes $15.00 1 minute $15.25 2 minutes $15.50 3 minutes $15.75 4 minutes $16.00 5 minutes $16.25

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