SOLUTION: A car rental company charges x dollars to rent a car, plus y dollars per kilometre. Find x and y if the rental charge is $90 for 100km, and $110 for 150km. Thank you.

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A car rental company charges x dollars to rent a car, plus y dollars per kilometre. Find x and y if the rental charge is $90 for 100km, and $110 for 150km. Thank you.      Log On


   

Question 456310: A car rental company charges x dollars to rent a car, plus y dollars per kilometre. Find x and y if the rental charge is $90 for 100km, and $110 for 150km.
Thank you.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
The confusing part is using x and y for those variables.
Usually they would be m and b
r=dy+x
90=100y+x
110=150y+x
x=50
y=2/5
the equation would be
r=(2/5)*d+50
check
90=2/5*100+50
90=40+50
ok
check
110=150*2/5+50
110=60+50
ok