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m1 = 2
tegak lurus = m1 × m2 = -1
= 2 × m2 = -1
= 2m2 = -1
= m2 = -1/2
(y-y1) = m2 (x-x1)
y+3 = -1/2 (x+2)
y+3 = -1/2x - 1
y = -1/2x - 4