### Home > MC2 > Chapter 9 > Lesson 9.2.2 > Problem9-55

9-55.
1. A candy store's specialty is taffy. Customers can fill a bag with taffy and the price is based on how much the candy weighs. The store charges $2 for 10 ounces of taffy. 9-55 HW eTool (Desmos). Homework Help ✎ 1. Copy the table below and fill in the missing values. Add three more entries.  Amount of taffy (ounces) 2 5 10 12 15 20 Price ($) $2$4
2. Graph the values in the table. Let x represent the number of ounces and y represent the price in dollars.

3. Is this situation proportional? Explain your reasoning.

4. What is the slope of the line you graphed? What information does the slope tell you?

Try writing a proportion equation.

$\frac{10\text{ ounces}}{2\text{ dollars}}=\frac{2\text{ ounces}}{x\text{ dollars}}$

Solve for x.

Does the price per ounce stay the same no matter how many ounces of taffy is bought?

Notice that the graph makes a straight line and intersects (0,0).

$\text{Slope can be defined as: }\frac{\text{rise}}{\text{run}} \text{ or } \frac{\text{change in }y}{\text{change in }x}$

The slope, 0.2, tells you that the price of taffy per ounce is \$0.20.

Complete the table in the eTool below to graph the points.
Click the link at right for the full version of the eTool: MC2 9-55 HW eTool