In the xy-coordinate plane, line l and k intersect at the point (4,3). Is the product of their slopes negative?
1) The product of the x-intercepts of lines l and k is positive
2) The product of the y-intercepts of lines l and k is negative
Pls explain. Thanks.
OA - C[/spoiler]
co-ordinate - gmatprep
This topic has expert replies
-
- Legendary Member
- Posts: 645
- Joined: Wed Sep 05, 2007 4:37 am
- Location: India
- Thanked: 34 times
- Followed by:5 members
arocks,
Slop = y-intercept/ x-intercept
say y-intercept of l and k be y1 and y2
x-intercept of l and k be x1 and x2
So m1 * m2 = (y1 * y2) / (x1 * x2)
So to find out whether m1 * m2 < 0, we have to know the fact whether both (x1 * x2) and (y1 * y2) are < 0 or not. So C is the answer to chose.
Slop = y-intercept/ x-intercept
say y-intercept of l and k be y1 and y2
x-intercept of l and k be x1 and x2
So m1 * m2 = (y1 * y2) / (x1 * x2)
So to find out whether m1 * m2 < 0, we have to know the fact whether both (x1 * x2) and (y1 * y2) are < 0 or not. So C is the answer to chose.
Correct me If I am wrong
Regards,
Amitava
Regards,
Amitava