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

9-55.

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)

1. Copy the table below and fill in the missing values. Add three more entries.

 Amount of taffy (ounces) Price (\$) $2$ $5$ $10$ $12$ $15$ $20$ $2$ $4$

Try writing a proportion equation.

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

Solve for $x$.

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.

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

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

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

Slope can be defined as: $\frac{\text{rise}}{\text{run}}$ 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: 9-55 HW eTool (Desmos)