[ y = -2x + any other number ] is parallel to [ y = -2x + 6 ].
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Y=2X+4. You must only change the plus blank...
Minus one half, (-1/2).
The second equation works out as y = -1/2x+6 therefore it is perpendicular
[ y = 2x + 5 ] has a slope of 2. [ y = 2 ] is a horizontal line ... its slope is zero. Their slopes are different, so they're not parallel.
They are parallel.