if you could exactly afford either 2 units of x and 7 units of y, or 4 units of x and 3 units of y, then if you spent all of your income on y, how many units of y could you buy?
A)11
B)7
C)15
D)6
E)None of the above.

Question

Quizplus · Accepted Answer

The cost of 2x + 7y is equal to the cost of 4x + 3y. Solving these equations, we find that the cost of x is equal to the cost of 2y. Therefore, if you spend all your income on y, you can buy 11 units of y.

If You Could Exactly Afford Either 2 Units of X