SOLUTION: it costs $3 for a car and $10 for a bus to park in a parking lot. there are 102 vehicles in the lot and altogether they paid $418 to park. how many cars are there in the lot ?

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Question 204956: it costs $3 for a car and $10 for a bus to park in a parking lot. there are 102 vehicles in the lot and altogether they paid $418 to park. how many cars are there in the lot ?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
car=x=86
bus=y=16
3x+10y=418
x+y=102, x=102-y
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3(102-y)+10y=418
306-3y+10y=418
7y=112
y=16
----------------
x+16=102
x=86