Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 1 - Linear Functions - 1.5 Finding Equations of Lines - 1.5 Exercises - Page 75: 18


y=14x + 150

Work Step by Step

We can treat the quantity of shirts as j and the price of them as y, so our two points will be (15,360) and (25,500). Using $\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$ to find the slope, we get m= $\frac{500-360}{25-15}$ = $\frac{140}{10}$ = $14$ Now, using y=mx+b: y=14x + b 500=14(25)+b 500=350+b 150=b y=14x + 150
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