If two lines have the same slope (ie. they rise or fall at the same angle) they are parallel.
With lines, the number before the x determines the slope. So as long as your line has a 2x term, and is written in the same form as y = 2x + 3, it will be parallel.
Therefore,
y = 2x + 7
y = 2x +5556
y = 2x - 3
y = 2x - 0.7561
... are all parallel lines to y = 2x + 3
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Yes, they're parallel lines. Both slopes are 2.
The lines are parallel, but not the same.
They are parallel.
They are parallel lines.
parallel