exam Maths Puzzle Numerical Ability

The length of a rectangle is 3 times as much as the width. the width is given as 6. find the length and the perimeter of the rectangle.

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2x+y+4=0
x-y+2=0

Note to student: i have changed your equations by adding =0 to each one. There is no other way to have a linear equation - in an equation there is always an equal sign. How can I find the constan in this problem thank you for your help

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If y varies directly with x, and y = 54 when x = 3, find the constant of variation k