Find the type of triangle given 3 lines (justify your answer)

Determine the type of triangle that is formed by the lines x+y=11, x-y=1 and x-3y=3. Justify your decision?
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1 Answer

Rewrite the equations:

y=-x+11 is perpendicular to:

y=x-1, because the slopes are -1 and 1 (when the product of two slopes = -1, the two lines are perpendicular)

y=⅓x-1.

It’s a right triangle.

by Top Rated User (1.2m points)

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