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# Two lines intersect at (4,3) in the xy-plane. Is the product

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Joined: 30 Oct 2004
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Two lines intersect at (4,3) in the xy-plane. Is the product [#permalink]  24 Oct 2005, 13:18
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Two lines intersect at (4,3) in the xy-plane. Is the product of their slopes negative?
1) product of their x-intercepts is positive
2) product of their y-intercepts is negative
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-Vikram

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Joined: 22 Aug 2005
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C.

In order for slope to be -ve, slope of one line should be +ve, other -ve

Using co-ordinate place, you can see two statements seperatly does not quarantee that.
Together, they are sufficient.
Manager
Joined: 04 Oct 2005
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I agree 100%

make a little sketch and you can easily plot the possible ways. If the product of the slope shall be negative, then one must be negative and the other positive..... the statements combined provide this.
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