Question 706092
x is for price of a bird feeder.
y is for how many feeders are sold in a week based on the price, x.


Two points already understood:  (10,22) and (11,20).  That second point is based on the known +1 dollar price causing 2 fewer feeders sold per week.

Slope if a line, is -2/1= -2.
Using y=mx+b form, solving for b, and then using either point gives b=42.


Equation is {{{y=-2x+42}}}.