The demand equation for the BWS Bluetooth wireless loudspeaker is p=-0.05x+200 where x is the quantity demanded per month and p is the unit price in dollars. Sketch the graph of the demand curve.

Question

How can I start? What points could I plot?
So I am thinking that I can take on this equation 2 ways:
P= -0.05(0)+200 =200 & 0=-0.05x+200=4000
For (4000,200). Would 4000 be the x value and 200 be the y value? And if correct, would 200 go on the y axis and 4000 on the x axis?
Then the question asks "what is the highest price (theoretically) anyone would pay for a BWS wireless loudspeaker?" How would I start solving it there?

Answer 1

choose x and calculate p
p=-0.05x+200
(0,200),(20,199),(100,195),...(4000,0)
makes sense - no one wants it if the price is steep...
when x=1, p=199.95, the highest price when someone actually buys one.

Answer 2

But wouldn't the highest price be 200 when x=0? since when x is 2 and so on the price seems to decrease.