GreenlightTestPrep wrote:
Carcass wrote:
If xy > 0, which of the following CANNOT be true?
A. x > 0
B. y < 0
C. x + y > 0
D. x/y > 0
E. x/y < 0
When it comes to positive and negative numbers, the rules for multiplication are THE SAME as the rules for division.
So....
(
POSITIVE)(
POSITIVE) =
POSITIVE and POSITIVE/
POSITIVE =
POSITIVE (
POSITIVE)(
NEGATIVE) =
NEGATIVE and POSITIVE/
NEGATIVE =
NEGATIVE(
NEGATIVE)(
NEGATIVE) =
POSITIVE and NEGATIVE/
NEGATIVE =
POSITIVE So, if xy is
POSITIVE , it must also be true that x/y is
POSITIVE In other words,
x/y cannot be negativeAnswer: E
Yes, but given the same logic, B also cannot be true.