exam Maths Puzzle Numerical Ability

are these parallel, perpendicular or both?

3y+x=6 and 2y-6x=12

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exam Other Question

find any rational roots for the equation: x^4 + 3x^3 - x^2 - 9x - 6 = 0 simplify by comining like terms with radicals

x/18 - 3/8x^2