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tegak lurus m2 = -1/m1 = √5/ (4)
garis singgung --> y = mx+_ √(a²m²+b²)
y = 1/4 x√5 +- √{(16)(5/16)+(4)}
y = 1/4x √5 +- √9
y= 1/4 x√5 + 3 atau y = 1/4 x√5 - 3