Question

Under her cell phone plan, Grace pays a flat cost of $70 per month and $4 per

gigabyte. She wants to keep her bill at $74.40 per month. Write and solve an equation
which can be used to determine x, the number of gigabytes of data Grace can use
while staying within her budget

Answer 1

• Flat cost=$70
• Per GB cost=$4
• Let total GB=x

AtQ

`\\ \tt\longmapsto 70+4x=74.40`

`\\ \tt\longmapsto 4x=4.40`

`\\ \tt\longmapsto x=1.10GB`

• 1GB and 100mB

Answer 2

• 1.1 GB

Explanation:

Let the number of gigabytes is x.

Required equation is:

• 4x + 70 = 74.40
• 4x = 74.40 - 70
• 4x = 4.40
• x = 4.40/4
• x = 1.1