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Scalar projection

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Please see the attached file for the full problem.

How can I use a scalar projection to show that the distance from a point?

P[1](x[1], y[1]) to the line 3*x-4*y+5 = 0 is > abs(a*x[1]+b*y[1]+c)/sqrt(a^2+b^2);

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This solution shows how to use a scalar projection to show that the distance from a point.

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The trick is to draw a vector B along the line between two points. One is completely arbitrary (x0,y0) and the other is the point on the line (x2,y2) which is closest to the point ...

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