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m = y2 - y1 / x2 - x1
m = 0 - 3 / -1 - 2
m = -3/-3
m = 1
y - y1 = y2-y1 / x2-x1 (x - x1)
y - 3 = 0-3 / -1 - 2 (x - 2)
y - 3 = -3/-3 (x - 2)
-3 (y - 3) = -3 (x - 2)
-3y + 9 = -3x + 6
-3y = -3x - 3
----------------- ÷ -3
y = x + 1
atau
x - y + 1 = 0
maaf kalo salah