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The phone company A Fee and Fee 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
310 minutes, the monthly cost will be $68. If the customer uses 620 minutes, the monthly cost will
be $99.

A) Find an equation in the form y = mx + b, where x is the number of monthly minutes used and
y is the total monthly cost of the A Fee and Fee plan.
Answer: y =
B) Use your equation to find the total monthly cost if 980 minutes are used.
Answer: If 980 minutes are used, the total cost will be
dollars.

The Phone Company A Fee And Fee 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 P class=

Sagot :

mhanifa

Answer:

The equation is:

  • y = mx + b

We have two points:

  • (310, 68) and (620, 99)

A)

Find the slope using these two points:

  • m = (99 - 68)/(620 - 310) = 31/310 = 0.1

Use one of the points to find the y-intercept b:

  • 68 = 0.1*310 + b
  • 68 = 31 + b
  • b = 68 - 31
  • b = 37

The equation is:

  • y = 0.1x + 37

B)

Find the value of y when x = 980:

  • y = 0.1*980 + 37
  • y = 98 + 37
  • y = 135

The total cost is $135

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