My question is that why the answer is E instead of C. Any help would be appreciated.
What is x?
1) x=4y-4
2) xy=8
The solution given in the MGMAT guide explains that because after substitution, there are two different answers y = -1 and y = 2 which makes x = -8 and x = 4.
Since we can solve x with two statements together, why isnt the answer C? Instead of E (both statements together are not sufficient). Thanks in advance.![]()
What is x?
1) x=4y-4
2) xy=8
The solution given in the MGMAT guide explains that because after substitution, there are two different answers y = -1 and y = 2 which makes x = -8 and x = 4.
Since we can solve x with two statements together, why isnt the answer C? Instead of E (both statements together are not sufficient). Thanks in advance.
