If a Consumer Purchases Two Goods, Food (Measured Along The x

Multiple Choice

If a consumer purchases two goods, food (measured along the $x$ axis) and housing (measured along the $y$ axis) , and if the price of food is $3 per unit and the price of housing is $400 per unit, then what is the slope of the consumer's budget constraint if the consumer has an income of $600?

A) -3/600.
B) -3/400
C) -400/600
D) -400/3