10. The line through the points (h, 3) and (4,1) intersects the line 7x − 9y − 19 = 0. at right angle. Find the value of h.
10. The line through the points (h, 3) and (4,1) intersects the line 7x − 9y − 19 = 0. at right angle. Find the value of h.
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