Each square on Olivia's chessboard is 21 square centimeters. A chessboard has 8 squares on each side. To the nearest tenth, what is the width of Olivia's chessboard?

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

step-by-step explanation:

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i believe that the answer is

b. y-1=-2(x-4)

hope this !