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There are 39 motorcycles and cars they have a total of 138 wheels how many cars are there?
Sorry the last answer posted was incorrect.
x = number of motorcycles
y = number of cars
x + y = 39 (total number of motorcycles & cars)
2x + 4y = 138 (total number of wheels; motorcycles -2 , cars -4)
You need to solve these 2 equations together, I used the elimination method:
multiply the 1st equation by 4 and subtract the 2nd equation from it:
4*(x+y=39) --> 4x + 4y = 156
2x + 4y = 138
--------------------------------------------
2x = 18
x = 9
Substitute x=9 into 1st equation & solve for y to find the number of cars, in this case it will be 30 cars.
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