
Concept explainers
(a)
Write a direct variation equation relating your post to message receives. Then graph the equation.
(a)

Answer to Problem 9CYU
The equation
Explanation of Solution
Given:
Number of messages post = 5 and number of messages receives = 12
Concept Used:
Let the number of message post is x and number of message receive is y
Y is directly varies with x.
We can write direct variation equation that relates x and y is
k is the constant of variation.
Calculation:
Direct variation equation that relates x and y is
Given:
Number of messages post = 5 and number of messages receives = 12
The equation that relates the number of message receive to the post is
The slope of the equation
Write the slope as Graph (0,0). From there move up 12 units and right 5 units to find another point. Then draw a line containing the points. | ![]() |
Thus, the equation
(b)
Find the number of messages you need to post to receive 96 messages.
(b)

Answer to Problem 9CYU
You need to post 40 messages to receive 96 messages.
Explanation of Solution
Given: The equation
Concept Used:
To find the number of messages you need to post to receive 96 messages, we need to plug in y = 96 and solve for x.
Calculation:
So, you need to post 40 messages to receive 96 messages.
Thus, you need to post 40 messages to receive 96 messages.
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