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- anonymous

Market research has shown that at a price of $230, 100 number of plasma TV’s are sold and if the price is reduced to $190, then 200 number of TV’s are sold. Find the equation that represents this demand curve and state in the form of p=mx+b (Slope Intercept Form of a Linear Equation).

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- anonymous

p=mx+b
is p the price?
if yes, plug the numbers and you'll get two equations
230 = 100m + b and
190 = 200m + b
solve those equations, you'll get m = -2/5 and b=270
so the equation is
p = -(2/5)x + 270
to check whether this equation is right or not, plug the (100,230) or (200,190)

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