exam Maths Puzzle Numerical Ability

Determine whether the following pairs are parallel or not parallel

1. y=3/4x+6
y=3/4x-2

2. y=6x
y=6x-3

3. y=1/2x+1
y=2x-3

4. y=1/2x+4
y=4/8x-1

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exam Other Question

Find the product or quotient. Write the answer using exponents.

10^9 x 10^2

Any help with this problem would be GREATLY</b> appreciated:) We have been trying to figure this out and I fear we are over-thinking it. Therefore making it much more complicated than it actually is..Please help.