Hello!
Parallel lines have the same slope.
Since the slope of the given line is 3, then the slope of the line parallel to this line is also 3.
First, let's write the equation in Point-Slope form:
y-y1=m(x-x1)
y-10=3(x-0)
y-10=3x
y=3x+10 (Answer)
Hope everything is clear.
Let me know if you have any questions!
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