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08 Jul 2005, 07:43
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pls explain this
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08 Jul 2005, 09:18
Kudos
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C)...
1) insufficient because we only know that the width of the 2 parabolas is the same and that they are inverse. we need to know tha intercetion with the x-axis so as to define whether they cross => insufficient
2) we only know that the intersection of one of the parabolas lies above the other. => insufficient
1)+2) they are inverse and they have different x-axis-intersections so that the one that goes down lies above the one that goes up. they will cross.
1) insufficient because we only know that the width of the 2 parabolas is the same and that they are inverse. we need to know tha intercetion with the x-axis so as to define whether they cross => insufficient
2) we only know that the intersection of one of the parabolas lies above the other. => insufficient
1)+2) they are inverse and they have different x-axis-intersections so that the one that goes down lies above the one that goes up. they will cross.
08 Jul 2005, 10:48
Kudos
Bookmarks
Initially I was thrown off by the form y = mx^2 + b, I am used to the form y = mx + b, so my reasoning may be totally wrong.
From the question stem:
Line 1 is intersecting y-axis at (0, b)
Line 2 is intersecting y-axis at (0, d)
Statement1: The slope of the equation is reversed, so one is moving up and the other is moving down but we do nott know whether they will meet.
Statement2: Line 1 may intersect y-axis at (0,4) and line 2 may intersect y-axis at (0, -4) but we do not know their slopes so inconclusive.
Both statements put together,we know that one slopes upwards and other downwards and they intersect y axis at different points, so yes they will have to meet at some place.
From the question stem:
Line 1 is intersecting y-axis at (0, b)
Line 2 is intersecting y-axis at (0, d)
Statement1: The slope of the equation is reversed, so one is moving up and the other is moving down but we do nott know whether they will meet.
Statement2: Line 1 may intersect y-axis at (0,4) and line 2 may intersect y-axis at (0, -4) but we do not know their slopes so inconclusive.
Both statements put together,we know that one slopes upwards and other downwards and they intersect y axis at different points, so yes they will have to meet at some place.
