exam Maths Puzzle Numerical Ability

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.

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exam Other Question

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
Jill has $3.50 in nickels and dimes. If she has 50 coins, how
many of each type of coin does she have?