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(x - 2)² - 4 + (y - 3)² - 9 - 4 = 0
(x - 2)² + (y - 3)² = 17
persamaan garis singgungya melalui titik (1,-1) adalag
(x-a)(x1-a) + (y-b)(y1-b) = r²
(x - 2)(1 - 2) + (y - 3)(-1 - 3) = 17
(x-2)(-1) + (y-3)(-4) = 17
- x + 2 - 4y + 12 = 17
4y = -x + 14 - 17
4y = -x - 3 atau y = (- 1/4)x - 3/4
:: x1.x y.y1 1/2 .A(x x1) 1/2.B(y y1) C= 0
:: x - y (-4)/2 ( x 1) (-6)/2 ( y - 1) - 4
:: x - y -2( x 1) -3(y - 1) - 4
:: x - y -2x - 2 -3y 3-4
:: -x - 4y - 3 = 0 subs aj ksana..:D