exam Maths Puzzle Numerical Ability

How do i make an appropriate substitution?(y-10/y)^2 -6(y-10/y)-27=0

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exam Other Question

Solve. -3(x + 2) + 4x = 5x + 18 �Find the equation of the line that passes through the points (-3.2, 8) and (14.7, -1).
�Find the equation of the line that is parallel to the line in a) and passes through the origin.