exam Maths Puzzle Numerical Ability

Given two lines whose equations are 3x+y-8 =0 and -2x+by+9 =0, determine the value of b such that the two lines will be perpendicular.
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exam Other Question

The length of a rectangle is 2ft more than the width. The perimeter is 20ft. Find length. Three times the larger numbers is equal to four times the smaller. The sum of the numbers is 21. Find the numbers.