Hello, hope you are having a splendid day. :)
y=-4x-9 is written in slope-intercept form (y=mx+b)
m is the slope and b is the y-intercept.
In this equation, the slope is -4 and the y-intercept is -9.
Hope it helps. Ask me if you have any queries.
~An emotional teen who helps others with joy
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Good luck.