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a = -3
b = 1
r² = 5 ==> r = √5
g: y + 2x - 4 = 0 ===> 2x + y - 4 = 0
gradien m :
syarat sejajar
persamaan garis singgung :
y = -2x - 1 + 5 = -2x + 4
y = -2x - 1 - 5 = -2x - 6