Question

This graph represents a proportional relationship between the number of months, x, data is used on a cell phone and the total cost of data usage, y.

The equation that represents the graph above is y =
x.

The cell phone company decides to raise the data prices to charge $90 every 2 months. The new equation that would represent this relationship is y =
x.

Answer 1

1) y = 40x

2) y = 45x

x = months

Explanation:

1) 40/1 = 40

2) 90/2 = 45

Answer 2

1. y = 40x

2. y = 90x

Explanation:

In the graph, for every one unit to the right, the graph increases by forty (up forty, over one). Since x is the unknown number of months, and it’s $40/month, y = 40x. After they raise the prices, it is $90 every month, so now it’s y = 90x. Hope this helps!