Clash of the coordinates!

Geometry Level 5

A right triangle has to be constructed with the legs parallel to the axes of co-ordinates. If the equations of the medians to the two legs are 3 x y + 1 = 0 3x-y+1=0 and m x y + 2 = 0 mx-y+2=0 , the number of values of m m for which, such a triangle exists can be expressed as a positive integer p p . Enter the value of p p as your answer.


The answer is 2.

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1 solution

Ujjwal Rane
Aug 2, 2016

Let B and H be the base and height of the triangle.

Of the two given lines, one has slope 3 and the other has slope m. The triangle has a vertical and a horizontal side.

The median with slope 3 will either meet the vertical side (height) of the horizontal side (base).

Case I - it meets the base at midpoint. So s l o p e = 3 = H B / 2 slope = 3 = \frac{H}{B/2} So line with slope m must meet the vertical side and m = H / 2 B = 3 4 m = \frac{H/2}{B} = \frac{3}{4}

Case II - The reverse of the above, so m will be four times, instead of one fourth of 3. So m = 12

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