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If the straight line 2x-3y+17-0 is perpe...

If the straight line 2x-3y+17-0 is perpendicular to the line passing through the points (7, 17) and `(15, beta)`, then `beta` equals

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The correct Answer is:
5
`((2)/(3))((17-beta)/(7-15))=-1`.
`34-2beta=24`.
`2beta=10`.
`beta=5`.
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