AT&T has two different cell phone plans you can choose from. If you choose plan A, you will pay a flat fee of $150 and $8 per gigabyte. If you choose plan B, you will pay a flat fee of $350 for unlimited gigabytes. How many gigabytes do you need to use for plan A and plan B to cost the same?
Let's represent the number of gigabytes needed as x.
For plan A, the cost is a flat fee of $150 plus $8 per gigabyte. So the total cost for plan A is 150 + 8x.
For plan B, the cost is a flat fee of $350 for unlimited gigabytes. So the total cost for plan B is always $350, regardless of the number of gigabytes used.
To find the number of gigabytes that makes the two plans cost the same, we need to set up an equation:
150 + 8x = 350
Subtracting 150 from both sides of the equation, we have:
8x = 200
Dividing both sides by 8, we get:
x = 25
Therefore, you need to use 25 gigabytes for plan A and plan B to cost the same.