The line is perpendicular to the line

MATHEMATICS · Subjective · A Level · Mathematics · Coordinate geometry in the (x y) plane · Coordinate geometry in the (x y) plane

Problem

The line 4x+5y−7=04x + 5y - 7 = 0 is perpendicular to the line kx−8y+3=0kx - 8y + 3 = 0. Find the value of kk.

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