1 Answer

Carl Von Buelow · Answer 1 · 2022-05-28T12:24:13+0000

Answer:

-1

Explanation:

y=mx+b

m -> Slope of line

-m -> slope of line perp. to the line with slope m

y=x+21 in your case

therefor, slope is -1 for a line perp to the given equation

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