Hi,
This post is intended specifically for Manhattan GMAT instructors, although all replies are welcome!
I'm on day 9 of the 60 day study guide. This DS question is taken from the Manhattan GMAT Quadratic Equations Problem set - Algebra book, p.71 question 10:
What is X?
1. x=4y-4
2. xy=8
The explanation shows the correct answer as E. If we combine both statements, answer C, we reach 2 solutions for X. Why is that not acceptable?
Can anyone explain to me how the wording implies that the question we are answering is: Does X have only 1 solution? After all when we solve quadratic equations, 2 solutions are an acceptable starting point, unless we can eliminate of the solutions. Where in the wording of this problem are we to understand that only solution 1 can be acceptable?
I do not agree with the premise of the question, that only 1 solution is an acceptable answer and currently am sticking to C.
Please explain / confirm.
Thanks!
Matan
This post is intended specifically for Manhattan GMAT instructors, although all replies are welcome!
I'm on day 9 of the 60 day study guide. This DS question is taken from the Manhattan GMAT Quadratic Equations Problem set - Algebra book, p.71 question 10:
What is X?
1. x=4y-4
2. xy=8
The explanation shows the correct answer as E. If we combine both statements, answer C, we reach 2 solutions for X. Why is that not acceptable?
Can anyone explain to me how the wording implies that the question we are answering is: Does X have only 1 solution? After all when we solve quadratic equations, 2 solutions are an acceptable starting point, unless we can eliminate of the solutions. Where in the wording of this problem are we to understand that only solution 1 can be acceptable?
I do not agree with the premise of the question, that only 1 solution is an acceptable answer and currently am sticking to C.
Please explain / confirm.
Thanks!
Matan
