exam Maths Puzzle Numerical Ability

How do I simplify 3n-4 divided by 4-3n and how do I simplify 6y cubed + 12y over 9y cubed + 18y squared

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exam Other Question

9x-5x^2=-2

2x^2-3x=x^2+18

15x^2+x=2

x^2-6x+9=-16
line 1 passes through the points (1,-2) and (-2,-4)
line 2 passes through the points (2,2) and (0,5)
is the prependicular or parallel