Concept Byte: Using Tables to Solve Equations

Use With Lesson 1-8

TECHNOLOGY

You can solve equations by making a table using a graphing calculator.

Activity

A raft floats downriver at 9 mi/h. The distance y the raft travels can be modeled by the equation y = 9x, where x is the number of hours. Make a table on a graphing calculator to find how long it takes the raft to travel 153 mi.

Exercises

Solve each problem by making a table on a graphing calculator.

1. A town places 560 t of waste in a landfill each month. The amount y of waste in the landfill can be modeled by the equation y = 560x, where x is the number of months. How many months will it take to accumulate 11,200 t of waste in the landfill?
2. A coupon gives $15 off a customer's purchase. The total amount y of the customer's purchase can be modeled by y = x − 15 , y equals x minus 15 comma  where x is the amount of the purchase before the coupon is used. A customer using the coupon pays $17 for a shirt. What was the original price of the shirt?

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