Answer:
2y=6x+4
y=3x+2. That has a slope of 3 and is parallel to y=3x. All the others have a slope of something else.
If the slope is -3x, then 6x+2y=4 and 2y=-6x+4 and y=-3x+2
6x+2y=4 is the answer for the question y=- 3x
Explanation:
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