Figure 2-18
Relationship between Price and Restaurant Meals
-Refer to Figure 2-18.The slope of the line containing points Y and Z is
A)-0.5.
B)-1.
C)-2.
D)-4.

Question

Figure 2-18
Relationship between Price and Restaurant Meals 
-Refer to Figure 2-18.The slope of the line containing points Y and Z is
A)-0.5. 
B)-1. 
C)-2. 
D)-4.

Quizplus · Accepted Answer

The slope of a line is calculated as "rise over run" or the change in the y-coordinate divided by the change in the x-coordinate. From point Y to point Z, the price increases from $10 to $14, while the number of restaurant meals decreases from 20 to 10. Therefore, the change in the y-coordinate is -10 and the change in the x-coordinate is 4. So the slope is (-10/4) = -2. Therefore, choice C (-2) is the correct answer for the slope of the line containing points Y and Z.

Figure 2-18 Relationship Between Price and Restaurant Meals