book Maths Puzzle Numerical Ability

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WHAT IS THE SLOPE OF A LINE THAT IS PERPENDICULAR TO THE LINE PASSING THROUGH THE POINTS (8,3) AND (10,6)?

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book Other Question
3t-6=2t+8
4-y=17
4x=5<5x-8 The sum of two numbers is 23. Twice the greater number added to three times the smaller number is 57. Find the numbers.