1) Equilibruim price: You can sell 280 products per week if they are marked at $15 each, but only 240 each week if they are marked at $18 each. Your supplier is prepared to sell you 320 products each week if they are marked at $20 each and 220 each week if they are marked $12 each. Find the demand equation, supply equation and equilibrium price for this product, using variables P for sales piece and Q for sales quantity.
Now I NEED TO KNOW HOW TO DO IT AND I KNOW THE ANSWERS
Demand equation: q=-13.33p+480
Supply equation: 12.5p+70
Equilibrium Price: $15.87
I know how to get -13.33p but...

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formula for demand is q=mp+b
and I cant remember supply's formula :$
I need to know how to get B

And to get m i used x2-x1/y2-y1

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