exam Maths Puzzle Numerical Ability

are the following pairs of lines perpendicular, parallel or neither (hint solve for y)

2y-x=6
2y-x=-4

next one solve for y
-4x+y=-5
x+4y=8

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exam Other Question

Find an equation of the line containing the given pair of points.

(-3,-1) and (-9, -6)

Help please, can someone tell me how to figure this out, i have no idea!!
6x^2 - 28x + 16