exam Maths Puzzle Numerical Ability

Can someone help me with this one.
Determine whether the graphs of the equations are parallel lines, perpendicular lines or niether.
3x - 8y = -18
32x + 12y = -18
Thank you!

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exam Other Question
Solve for y in the following equations:

1. 25x-5y=15
y=_______


2. 18x+6y=(-12)y
y=_______ Triangle ABC is not isoceles. Prove that altitude BD would not bisect AC.