Junkfood Jill Spends All of Her Income on Jellybeans and Jolt

Junkfood Jill spends all of her income on jellybeans and Jolt cola. Suppose that Jill's income is $30, the price of a bag of jellybeans is $6, and the price of a bottle of Jolt cola is $2. If bags of jellybeans are graphed along the vertical axis and bottles of Jolt cola are graphed along the horizontal axis, what is the slope of the budget line?

A) 3
B) -3
C) 1/3
D) -1/3