A manufacturing company finds that they can sell 300 items at $3.50 per item and 500 items at $1.50 per item . If the relationship between the number of items sold x and the price per item p is a linear one :

Question

A manufacturing company finds that they can sell 300 items at $3.50 per item  and 500 items at $1.50 per item . If the relationship between the number of items sold x and the price per item p is a linear one :
Find a formula that gives x in terms of p(x)-100+b I need help find out the b in slope intercept form.
Now use the formula to find the number of items they will if the price per item is $2.50.
(300,3.5) (500,1.5)
P=mx+b
m=y_2-y_1/x_2-x_1=300-500/3.5-1.5=200/-2 -100
P=-100x+b
Please help me find b and maybe start part b for me. Thanks

Reiny · Answer

You asked the same question 2 days ago and I gave you a good start.
Did you not continue ?

https://www.jiskha.com/questions/1775681/A-manufacturing-company-finds-that-they-can-sell-300-items-at-3-50-per-item-and

Keonn'a · Answer

yes i did not continue because help finding b.