math
posted by Anonymous .
Suppose that a market research company finds that at a price of p=$25, they would sell x= 53 tiles each month. If they lower the price to p=$15, then more people will purchase the tile, and they can expect to sell x = 63 tiles monthâ€™s time. Find the equation of the line for the demand equation. Write the answer in the form p=mx+b

math 
drwls
Solve these two simultaneous equations for m and b:
25 = 53 m + b
15 = 63 m + b
10 = 10 m
m = 1
15 = 63 + b
b = 78
p = x + 78
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