Hello there, I am here to help you!
The equation of this line is written in slope-intercept form. In case you do not know what it looks like, I will tell you.
It looks like so:
y=mx+b
Where
m is the slope and b is the y-intercept.
Therefore, the slope is -2. Hope it helps. Use the comment section to clarify your doubts, and sorry for the late response.
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Good luck.