Question

under her cell phone plan, serenity pays a flat cost of $36 per month and $4 per gigabyte. she wants to keep her bill at $51.60 per month. write and solve an equation which can be used to determine x, the number of gigabytes of data serenity can use while staying within her budget.

answer attempt 1 out of 2

equation:

answer: ( x = )

Explanation:

Step1: Define the cost structure

The total cost is the flat cost plus the cost per gigabyte times the number of gigabytes. So the equation is $36 + 4x = 51.60$.

Step2: Solve for x

Subtract 36 from both sides: $4x = 51.60 - 36$.
$4x = 15.60$.
Divide both sides by 4: $x = \frac{15.60}{4}$.
$x = 3.9$.

Answer:

Equation: $36 + 4x = 51.60$