EDGE Math 8

A telecommunications company charges cellular phone calls in this way. If the length of calls in a month is 30 min, the monthly bill is ₱450. If the length of calls increases by 30 min, the monthly bill will increase by ₱165.

Choose your answer to each question.

1.	What is the formula for the monthly bill, assuming it is a linear function?

y = \frac{11}{2} x + 285

y = \frac{11}{2} x + 615

y = 11 x + 120

None of the choices

Answer: $y = \frac{11}{2} x + 285$

2.	How much will be the monthly bill when the length of calls is 90 min?

₱1110

₱945

₱780

None of the choices

Answer: ₱780

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