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⇒titik pusat di (a,b)= (2,-1)
berabsis -1 ; x= -1
(-1-2)²+(y+1)² = 13
-3²+(y+1)² = 13
9+(y+1)² = 13
(y+1)² = 13-9
y+1 = ±√4
y = ±2-1
y= 1 atau y= -3
maka titik yang berabsis -1 adalah (-1,1) dan (-1,-3)
(x-a)(x₁-a)+(y-b)(y₁-b) = r²
1. (x-2)(-1-2)+(y-(-1))(1-(-1)) = 13
(x-2)(-3)+(y+1)(2) = 13
-3x+6+2y+2-13 = 0
-3x-5+2y = 0
2. (x-2)(-1-2)+(y-(-1))(-3-(-1)) = 13
(x-2)(-3)+(y+1)(-2) = 13
-3x-2y+4-13 = 0
-3x-2y-9 = 0
yang ada diopsi adalah persamaan kedua ;
-(-3x-2y-9) = -0
3x+2y+9 = 0(D)