Hello! Here is my question:
I have in space a line AB where A (0,0,0) and
B (3,5,10). I have a point C (4,7,9). I need to find on line AB a point D where the line CD intersects AB if this lines are perpendicular to each other. Please show step by step. Thanks.

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Find vector AB.

ab = <3,5,10> right?

you need to determine if the lines even intersect

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