SOLUTION: The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 36 minutes of calls is $17.53 and the

Question 1148592: The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 36 minutes of calls is $17.53 and the monthly cost for 75 minutes is $21.82. What is the monthly cost for 59 minutes of calls?

Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!

x minutes y cost 36 17.53 59 ? 75 21.82

price

point-slope form,

substitute x with 59 to find the asked cost.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
You are given 2 points on the straight line
( 36, 17.53 )
( 75, 21.82 )
Let = Monthly cost of plan
Let = calling time in minutes
You can use the general point-slope formula

-----------------------------
min

$20.06 per month
Get a 2nd opinion if needed

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