Question

If 3x−y=12, what is the value of 8x2y?

A) 212
B) 44
C) 82
D) The value cannot be determined from the information given.

Answer 1

D

Explanation:

3x−y=12

rearranging y=3x-12 or x=y/3+4

8x*2y

=8x*(3x-12) or 8(y/3+4)*2y

=24x^2-96x or 16y^2/3+64y

either one value cannot be determined unless x or y is known

so ans is D) The value cannot be determined from the information given.

Answer 2

D.

Explanation:

3x - y = 12 or:-

y = 3x - 12

There are infinitely many values for x and y which fit this relation, so the value of 8x2y cannot be determined from the given information.