exam Maths Puzzle Numerical Ability

Given just the slop of two lines, how can I tell if they lines are perpendicular? Parallel?

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exam Other Question

the difference between two numbers is 24. If the larger is divided by the smaller, the qutient is 4 and the remainder is 3. Find the numbers. What is the value of k if one root root of (3k+1)x^2=-5 is 1? Please help me :)