Answer each question.
1. If you know that the direct variation equation is y = 3x and y = 12, what is x?
2. Using the same equation, what is y if x = 5?
3.
A train travels 400 km in 2 hours.
a. What is the rate?
b. Write a direct variation equation that expresses this relationship,
C.
using d for distance and t for time (in hours).
How many
hours would it take the train to travel 300 km? It would take
and the slope, or rate of change for each situation. Be sure to show
your
work.
H. Students are buying tickets for the fall dance. The student council keeps track of how many
tickets they sell in one week.
Number of Tickets Sold
Amount Earned ($)
Monday
10
50
Tuesday
15
75
hours.
Wednesday Thursday
23
28
115
140
Friday
32
160
If the data is graphed and passes through (0, 0) and (1,5), what is the constant of
proportionality of the relationship between number of tickets sold and amount earned?