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sub ke lingkaran x² + y² = 25
x² + (7x-25)² = 25
x² + 49x² - 350 x + 625 - 25 = 0
50x² - 350x + 600 = 0 atau
x² - 7x + 12 =0
(x - 4)(x - 3) = 0
x= 4 atau x= 3
x= 4 --> y= 7x -25 = 3 --> titik singgung (4,,3)
x= 3 --> y = 7x-25 = -4--> titik singgung (3, - 4)
persamaan garis singgung di (4,3) --> 4x + 3y = 25
persmaan garis singgung di(3,-4) --> 3x - 4y = 25