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m1 dari 5x+4y=9 ⇒ ax+by+c=0 ⇒ ax + by = -c
m1 = -a/b = -5/4
m2 = m1 = -5/4
m2 = Δy/Δx
m2 = y2 - y1 / x2 - x1
y2 - y1 = m2 (x2 - x1)
y - y1 = m2 (x - x1)
y - (-3) = -5/4 (x - 2)
y+3 = -5/4 x + 10/4
y + 5/4 x - 10/4 + 3 = 0
y + 5/4 x + 2/4 = 0
y + 5/4 x + 1/2 = 0