The gravitational attraction between two masses varies inversely as the square of the distance between them. if the attraction force between them is 75 lbs. when the bodies are eight feet apart, find the attraction when the masses are twelve feet apart.

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Below is the solution:

 Fr² = K 
75*64 = F(144) 
F = 75*64/144 = 33.3 lbs. 

pv = K 
16*24 = 30v 
v = 16*24/30 = 12.8 

va = K 
3000*2 = 6v 
v = 3000*2/6 = 1000 

Alinear relationship would look like a straight line on the graph. it could have a positive negative or 0 slope. so it could be a line potentially going in any direction but it must be perfectly straight.