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(x - 2)² + (y + 1)² = 6 --> r = √6
a) sejajar y = 2x + 1 --> m = 2
persamaan garis singgung lingkaran:
b) tegak lurus y = 4x - 2 --> m1 = 4, tegak lurus maka m2 = -1/4
semoga membantu ya :)