Data Sufficiency Q#59 from Algebra and equation solving module in GMAT Prep Now online course
does xy=x2 (x2 is x squares)
1)y2 - xy = 0 (y2 is x squared)
2)x2 - 2xy +y2 = 0 (x2 and y2 are squared)
I said answer was D that both are sufficient but the video said answer is B
but the way I solved statement 1) was as follows
y2 - xy = 0
--> y2 = xy add xy to both sides
--> y2/y = x divide both sides by y
--> y = x therefore xy must equal x2 and statement 1 should be sufficient in my eyes
where am I going wrong?
does xy=x2 (x2 is x squares)
1)y2 - xy = 0 (y2 is x squared)
2)x2 - 2xy +y2 = 0 (x2 and y2 are squared)
I said answer was D that both are sufficient but the video said answer is B
but the way I solved statement 1) was as follows
y2 - xy = 0
--> y2 = xy add xy to both sides
--> y2/y = x divide both sides by y
--> y = x therefore xy must equal x2 and statement 1 should be sufficient in my eyes
where am I going wrong?
