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x^2/100 + y^2/25 = 1
a^2 = 100
b^2 = 25
m = -3/8
persamaan garis singgung
y = mx +- V(a^2m^2 + b^2)
= -3/8 x +- V(100 .(-3/8)^2 + 25)
= -3/8 x + V(2500/64)
= -3/8 x + 50/8 kalikan 8
8y = -3x + 50
3x + 8y = 50
atau
y = -3/8 x - 50/8 kalikan 8
8y = -3x - 50
3x + 8y + 50 = 0