III. Price change and demand

a$.$ At the beginning, the price of Q $1$ is $P1-$$$9.$ What's the consumer's income? What is P $2?($Hint: The Q $2$ intercept is how many Q$2$ the consumer can afford when they spend all the money on Q$2.$ The same for the Q$1$ intercept.$)$

b$.$ P$1$ decreased twice, what are the two new prices?

c$.$ Use the information above to put three points on the demand curve for Q$1.$ Connect the three points to get a demand curve.