Section 3.6 Applications of Linear Equations and Modeling 255 Calculator Connections Topic: Using the Evaluate Feature on a Graphing Calculator In Example 3, the equation c 1.50x 19.95 was used to represent the cost, c, to buy x posters.To graph this equation on a graphing calculator, first replace the variable c by y. y 1.50x 19.95 We enter the equation into the calculator and set the viewing window. To evaluate the equation for a user-defined value of x, use the Value feature in the CALC menu. In this case, we entered x 125, and the calculator returned y 207.45. Calculator Exercises Use a graphing calculator to graph the lines on an appropriate viewing window. Evaluate the equation at the given values of x. 1. y 4.6x 27.1 at x 3 2. y 3.6x 42.3 at x 0 3. y 40x 105 at x 6 4. y 20x 65 at x 8 Section 3.6 Practice Exercises Study Skills Exercise On test day, take a look at any formulas or important points that you had to memorize before you enter the classroom.Then when you sit down to take your test, write these formulas on the test or on scrap paper.This is called a memory dump. Write down the formulas from Chapter 3. Review Exercises 1. Determine the slope of the line defined by 5x 2y 6. 2. Determine the slope of the line defined by 2x 8y 15. For Exercises 3–8, find the x- and y-intercepts of the lines, if possible. 3. 4. 5. 5x 6y 30 3x 4y 1 y 2x 4 6. y 5x 7. y 9 8. x 2
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