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A is the point (7,4 ). The straight lines with equations x+3y+1=0 and 2x+5y=0 intersect at B.

1. Find the coordinates of B and the gradient of AB

2. Hence show that AB is perpendicular to only one of these lines.

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Coordinates
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• Posted on Aug. 24, 2010 at 09:39:41AM
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Preview: ... intersection. So solving x+3y+1=0 and 2x+5y=0 simultaneously, we get Y= -2 and x=  5 B is (5,-2) For gradients, The gradient of the line joining the points (x 1, y 1) and (x 2, y 2) is: y ...

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a simple explanation for you
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• Posted on Aug. 24, 2010 at 09:57:17AM
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