SOLUTION: Company C uses a linear relationship and for 100 miles a day the rental cost is $50, while if you drive 400 miles a day the cost is $68. What is the formula?

Question 713507: Company C uses a linear relationship and for 100 miles a day the rental cost is $50, while if you drive 400 miles a day the cost is $68. What is the formula?
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
Assign those numbers to an arrangement of (x,y) coordinates; TWO of them.

Do as x for miles and y for cost. The points are (100, 50) and (400, 68). Two points - Find the linear equation.

Slope, m=(68-50)/(400-100)
m=18/300,

Point-Slope Form For a Line: . Substitute for m, Pick either of the data points for (,). Simplify.
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