The cost of renting a van for one day includes a flat rental fe plus a charge for each mile the van is driven when it is rented. A van that is driven 107 mle costs $97.15. A van that is driven 127 mils costs $106.15. What is the flat rental fee?

Question

anonymous · Answer

127 miles

jim766 · Answer

Do you know how to find eq of a line if you are given 2 points?

anonymous · Answer

yea.
y=mx+b

jim766 · Answer

They gave you 2 points 
(107, 97.50)
(127, 106.15)

anonymous · Answer

i need to find the slope of that?

anonymous · Answer

what is it that i need to do?

jim766 · Answer

Yeah , but note the first point should be (107, 97.15)
Not what I put

Y2-y1/x2-x1= slope to start

anonymous · Answer

can u list step by step what i have to do?

jim766 · Answer

106.15-97.15/127-107
9/20 =.45.  That is the slope

jim766 · Answer

Now need to find.  Y = mx + b
Pick one of the points,  (107. 15,  97.15)
97.15= .45(107.15) + b

Solve for b and that will be y intercept

anonymous · Answer

ok. then what?

jim766 · Answer

Sorry I mistyped again, duh
97.15= .45(107) + b
97.15= 48.15 + b
-48.15.      -48.15
49= b
That is the flat fee. $49

anonymous · Answer

oh ok. thanku :)