Suppose a market research company finds that at a price of p = $30, they would sell x = 32 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 month’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).

OK remembering that (x,y) is (x,p) in this system (ie number of sales is the input, or independent variable and the price is the output {only a _bit_ confusing}. you have 2 data points for the graph: (32,30) and (52,10) 1.) Find the slope = difference in p / difference in x = m 2.) find the intercept on p-axis (y-axis). Plug either coordinate pair into p=mx+b (you'll have "m" from step 1) to derive "b". 3.) Finally plug your "m" and "b" values into the generic slope-intercept equation: p=mx+b. good luck.

http://www.purplemath.com/modules/strtlneq.htm Half-way down if your struggling.

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