There is a line l given by the equation ax + by + c = 0 and the point P(x0, y0). Let Q(x1, y1) be projection of P on l. Am I right that 
?
There is a line l given by the equation ax + by + c = 0 and the point P(x0, y0). Let Q(x1, y1) be projection of P on l. Am I right that ?
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