8x-2y over 10xy if x=4 and y=-7
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The actual length of car is 42.857 foot
<em><u>Solution:</u></em>
Given that,
The scale of a railroad train set is 3.5 mm to 1 foot
The link of the model car in this it is 150 mm
To find: Length of actual car
Let "x" be the length of actual acr
From given,
Scale is:
3.5 mm : 1 foot
Then, given that link of the model car in this it is 150 mm
Then we get,
3.5 mm : 1 foot
150 mm : x foot
This forms a proportion and we can solve the sum by cross multiplying
Thus the actual length of car is 42.857 foot