If a consumer's income doubles, and the price of good X and good Y both double, will the budget line change in any way? Please give an explanation.

Equation of the budget line is

Y=(B/Py)-(Px/Py)X

(b) If you had an economic good, like food, and an economic "bad," like pollution, would you still have a downward sloping indifference curve? Please explain and show what the indifference curve for the economic good and the economic bad might look like in the graph given below.