Equation of lineBABAisx+y=1x+y=1. Find a unit vector along the reflected rayACAC.

The slope of the line AB is:          y=-x+1slope = m=-1or        tanα=-1or           α = -π4The equation of line AC is given by;           x cosπ4i^ + y sinπ4j˙ or          x2i^ + y2j^The unit vector in the direction of AC ray of reflection;             n^ =  x2i^ + y2j^x2+y22 =xx2+y2i^+yx2+y2j^or              n^ =xx2+y2i^+yx2+y2j^

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