Use a scalar projection to show that the distance from a point P1(x1, y1) to the line

Use a scalar projection to show that the distance from a point P1(x1, y1) to the line ax+by+c=0 is (|ax1+by1+c|)/sqrt(a^2+b^2). Use this formula to find the distance from the point (-2, 3) to the line 3x-4y+5=0.

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