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Verified answer
Jawabx² + y² -6x + 4y -12= 0
(x² - 6x) + (y² + 4y) = 12
(x - 3)² + (y +2)² = 12 +3² + 2²
(x - 3)² + (y +2)² = 25
pusat (a,b)= (3, -2)
r= 5
karna titik(7,-5) pada lingkaran, maka titik singgung (p,q) =(7,-5)
pers. gasing --> (7-3)(x -3) +(-5+2)(y+2) = 25
4(x - 3) - 3(y+2) = 25
4x -12 - 3y - 6 = 25
4x - 3y - 18 - 25 =0
4x - 3y - 43= 0