Polynomial's, demand equation

[sammymt59]

Market research compan finds that at a price of p=20 would sell x=42 tiles ea mnth. If the price is lowered to p=10 then more people would purchase the tile and they can expect to sell x=52 tiles. Find the equation of the line for the demand equation. (form p=mx+b.

I did it this way 10=m52=b, but am lost from there.

 

[Deleted member 4993]

Market research compan finds that at a price of p=20 would sell x=42 tiles ea mnth. If the price is lowered to p=10 then more people would purchase the tile and they can expect to sell x=52 tiles. Find the equation of the line for the demand equation. (form p=mx+b.

I did it this way 10=m52=b, but am lost from there.

If a straight-line goes through points P₁(x₁,y₁) & P₂ (x₂, y₂), then the equation of the line P₁P₂ is:

\(\displaystyle \dfrac{y - y_1}{y_2 - y_1} \ = \ \dfrac{x -x_1}{x_2 - x_1}\)

Now continue.......