y = kx + b
-3 = 2k + b
-5 = 4k + b
-5 - (-3) = 4k + b - 2k - b
-2 = 2k
k = -1
-3 = -2 + b
b = -1
y = - x - 1
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y = kx + b
-3 = 2k + b
-5 = 4k + b
-5 - (-3) = 4k + b - 2k - b
-2 = 2k
k = -1
-3 = -2 + b
b = -1
y = - x - 1