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m = Δu /Δy
jika u ada di sebalah kiri
m = -Δu/Δy
contoh :
sebalah kanan
2y = 4u + 6
m = 4/2
= 2
sebalah kiri
2y - 4u + 18 = 0
m = -(-4)/2
= 4/2
= 2