Does anyone understand this problem from my homework? Please help?..

A company discovers that to produce x=530 new electronic parts, it will cost y=$58710. To produce 990 new electronic parts, it will cost $103330.
Compute the slope of the costs and choose the most accurate statement from the following:
Costs are increasing at a rate of $97 per item.
Costs are increasing at a rate of $92 per item.
Costs are increasing at a rate of $96 per item.
Costs are decreasing at a rate of $97 per item.
Costs are decreasing at a rate of $96 per item.
Costs are decreasing at a rate of $92 per it

Question

Does anyone understand this problem from my homework? Please help?.. 

A company discovers that to produce x=530 new electronic parts, it will cost y=$58710. To produce 990 new electronic parts, it will cost $103330.
Compute the slope of the costs and choose the most accurate statement from the following:
Costs are increasing at a rate of $97 per item.
Costs are increasing at a rate of $92 per item.
Costs are increasing at a rate of $96 per item.
Costs are decreasing at a rate of $97 per item.
Costs are decreasing at a rate of $96 per item.
Costs are decreasing at a rate of $92 per it

anonymous · Answer

You basically have two points: (530,58710) and (990,103330).  Using those two points, you can calculate the slope, and the slope basically tells you whether the costs are increasing or decreasing and by how much per item.