Algebra, PLEASE HELP ME!!!
posted by Laura .
I am so lost, can anyone help me? I don't even understand what the teacher wants out of me with this problem.
Suppose that a market research company finds that at a price of p = $20, they would sell x = 42 tiles each month. If they lower the price to p = $10, then more people would purchase the tile, and they can expect to sell x = 52 tiles in a monthâ€™s time. Find the equation of the line for the demand equation. Write your answer in the form p = mx + b. (Hint: Write an equation using two points in the form (x,p)).

Algebra, PLEASE HELP ME!!! 
Mohamed
There are to points : (42,20) , (52,10)
m=(2010)/(4252)= 1 => m=1
choose any point from the two points .
(42,20)=(x1,p1)
pp1=m(xx1) => p20=1(x42)
p=x+42+20 => p=x+62
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