Question

Under his cell phone plan, Jacob pays a flat cost of $40.50 per month and $3 per

gigabyte. He wants to keep his bill at $48.90 per month. Write and solve an equation
which can be used to determine g, the number of gigabytes of data Jacob can use
while staying within his budget.

Answer 1

The constant for this equation would be 40.50 because it is the flat rate. We can use 3g to represent how it costs $3 per gigabyte. Our equation is going to be 3g + 40.50 = 48.90.

Our goal is to isolate g. We can do that by subtracting 40.50 from both sides. This gives us 3g = 8.4. Then, we need to divide both sides by 3. This gives us g = 2.8. Jacob can use 2.8 gigabytes or less to stay within the budget.