Question

The company charges a flat rate of $25 per month in addition they charge $0.05 for each minute of service.

A.write a linear equation for the monthly charge based upon the numberof minutes of service each month.
B.what is the slope?
C.what is the y-intercept?
D.what would be the change for 100 minute of service?
E.You Can afford a $55 phone bill each month. How long can you afford to talk on the phone each month?

PLEASE SHOW ALL THE WORK. PLEASE, PLEASE, PLEASE!!!

Answer 1

The gradient of a line shows the rate of change. The slope is m = 0.05
The fixed cost is for y-intercept, y = 25

The equation of the straight line is
`y=0.05x+25`

The cost of 100 minutes usage is
`y=0.05(100)+25=75`


`y=0.5x+25`

`55=0.5x+25`

`(55-25)/(0.5)=x`

`x=60`