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Find the equation of the straight line passing through the point (3, 3) which is perpendicular to the line y=-x-4
Answer: y=x The slope of the perpendicular line is the opposite reciprocal. So you do -(-1/1) which equals 1. So now we have y=x+b. Plug (3,3) into this and you get 3=3+b. So b=0 and the equation is y=x
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