The phone company Ringular has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses 420 minutes, the monthly cost will be $104. If the customer uses 720 minutes, the monthly cost will be $164.

A) Find an equation in the form y=mx+b,

y=mx+b,

where x

x

is the number of monthly minutes used and y

y

is the total monthly of the Ringular plan.

Question

Mathematics

Audrina Mullen

23 February, 13:31

The phone company Ringular has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses 420 minutes, the monthly cost will be $104. If the customer uses 720 minutes, the monthly cost will be $164.

A) Find an equation in the form y=mx+b,

y=mx+b,

where x

x

is the number of monthly minutes used and y

y

is the total monthly of the Ringular plan.

+3

Answers (1)

Know the Answer?

Brianna Stein · Answer 1

(420,104) (720,164)

slope = (164 - 104) / (720 - 420) = 60/300 = 1/5

y = mx + b

slope (m) = 1/5

(420,104) ... x = 420 and y = 104

now we sub and find b, the y int

104 = 1/5 (420) + b

104 = 84 + b

104 - 84 = b

20 = b

so ur equation is : y = 1/5x + 20