exam Maths Puzzle Numerical Ability

Graph the following equation a table of values. y=-2x+3

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I do not understand this?

Express 50(ten) in binary, trinary and base 4.

thankyou Danielle I can not find the correct answer to this one I got -5/1 for my answer. I need to find the slope of any line perpendicular to the line through points(0,5) (-3,-4)help me if you can.