5
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A parallel line has the same gradient but different intercept.
y = 3x
y = 3x + 1
y = 3x - 1
etc
are all parallel to y = 3x - 2.
If you have a specific point (xo, yo) that the line that is parallel to y = 3x - 2 must pass through, you can use:
y - yo = m(x - xo)
with m = 3 for y = 3x - 2 and which would re-arrange to:
y = 3x -3xo + yo
5
y=-2.5 is parallel to the x axis. The equation of the x axis is y=0
The slope is 5. Parallel lines always have the same slope.
The equations will have the same slope as y = 5x+9 but a different y intercept
the line is parallel to y=1/3x-1