Question

Under her cell phone plan, Lily pays a flat cost of $55.50 per month and $4 per

gigabyte. She wants to keep her bill at $63.10 per month. Write and solve an equation
which can be used to determine x, the number of gigabytes of data Lily can use while
staying within her budget.
equation:
answer x=

Answer 1

Equation: 4x+55.5=63.1

Answer: x=1.9

Answer 2

Equation : y = 4x + 55.50

x = 1.9 gigabytes

Explanation:

Given that:

Flat fee per month = $55.50

Cost per gigabyte = $4

Let,

x be the number of gigabytes.

y be the total cost

y = 4x + 55.50

Lily wants to keep her bill $63.10

63.10 = 4x + 55.50

63.10 - 55.50 = 4x

4x = 7.60

Dividing both sides by 4

`(4x)/(4) = (7.60)/(4)\\x=1.9`

Hence,

Equation : y = 4x + 55.50

x = 1.9 gigabytes