Comparing Cell Phone Plans Costs

The video tutorial compares two cell phone plans by defining variables and writing linear equations. It analyzes costs for different data usages (4GB and 12GB) to determine which company is cheaper. The tutorial also calculates the data usage at which both plans cost the same and verifies this graphically.

What are the two unknowns in the problem of comparing cell phone plans?

• Number of calls and text messages

• Monthly fee and data speed

• Data speed and monthly cost

• Monthly cost and number of gigabytes used

What is the linear equation for Company A's cell phone plan?

• C = 70 + 5x

• C = 35 + 10x

• C = 70 + 10x

• C = 35 + 5x

If 4 gigabytes of data is used, what is the monthly cost for Company A?

• $90

• $75

• $70

• $85

Which company is cheaper if 4 gigabytes of data is used?

• Both are the same

• Company B

• Cannot be determined

• Company A

How much cheaper is Company A compared to Company B when 4 gigabytes of data is used?

• $25

• $20

• $15

• $10

What is the monthly cost for Company A if 12 gigabytes of data is used?

• $125

• $130

• $155

• $140

Which company is cheaper if 12 gigabytes of data is used?

• Company A

• Company B

• Both are the same

• Cannot be determined

How much cheaper is Company B compared to Company A when 12 gigabytes of data is used?

• $30

• $25

• $15

• $20

At how many gigabytes do both companies have the same monthly cost?

• 8 gigabytes

• 7 gigabytes

• 6 gigabytes

• 5 gigabytes

What is the monthly cost when both companies charge the same amount?

• $100

• $115

• $105

• $110