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bagi 5
x² + y²/5 = 1
periksa titik ( -2, -1) terhadap elips x² + y²/5 = 1
5(4) + 1 > 5 --> titik (-2, -1) diluar elpis
gari polar titik (-2, -1) --> -2x - y/5 = 1
atau kalikan 5 --> -10x - y = 5
atau y = -10x - 5 sub ke 5x² + y² = 5
5x² + (-10x - 5)² = 5
5x² + 100x² +100x + 25 - 5= 0
105x² + 100x + 20 = 0 --> bagikan 5
21x² + 20x + 4 = 0
(7x+2)(3x+2) = 0
x = - 2/7 dan y = -10x - 5 = - 15/7
x = - 2/3 dan y = -10x - 5 = 5/3
..
tik singgung (- 2/7, -15/7) --> x1x +y1 y/5 = 1
-2/7 x- 15/7 (y/5) = 1
- 2/7 x- 3/7 y = 1 --> kalikan 7 --> -2x - 3y = 7
atau 2x + 3y + 7= 0
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tik singgung ( -2/3, 5/3) --> x1x + y1 y/5 = 1
- 2/3 x+ 5/3(y/5) = 1
- 2/3x + 1/3 y= 1 kallikan 3
- 2x + y = 3 atau 2x - y + 3= 0
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pers gasing nya 2x+3y +7 = 0
atau 2x - y + 3 = 0