exam Maths Puzzle Numerical Ability

i got a few questions to be asked What is -2x multiply 3x,-2xy multiply 3x -16 / 4x, 3x + 4x, -2y + 4y

Thanks Benny

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exam Other Question

i also need #16 answered also same chapter, and we are working on rational expressions I need help I am not sure How to do this problem

Find the slope of any line perpendicular to the line through points (0, 5) and (-3, -4). (Rewrite into standard form)