exam Maths Puzzle Numerical Ability

3^x-5=3

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exam Other Question

Determine which two equations represent parallel lines.
(a) y = 9x – 7 (b) y = –9x + 7 (c) y = 9x + 3 (d) y = -1/9x – 7

I have no idea even how to begin to figure this out.
What order are these in?

0, 2, 3, 6, 7, 1, 9, 4, 5, 8