Answer: From the graph, we can see that the cost of sending 1 text message is $0.05, the cost of sending 5 text messages is $1, and the cost of sending 20 text messages is $4.
The cost increases linearly with the number of text messages sent. This means that the cost per text message is constant, which is the slope of the line.
To find the equation that will calculate the cost for sending x text messages, we need to determine the slope of the line.
From the graph, we can see that the line passes through the points (1, 0.05) and (20, 4).
The slope of the line is:
slope = (change in y) / (change in x) = (4 - 0.05) / (20 - 1) = 0.1975
So the equation that will calculate the cost for sending x text messages is:
y = 0.1975x
This is not one of the answer choices given in the question. However, we can see that the closest answer choice is y = 0.20x. Therefore, the correct answer is:
y = 0.20x
Note that this is only an approximation and not the exact equation that represents the data in the graph, but it should be close enough for practical purposes.
Explanation: