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0² + 0² + 2a x 0 + 2b x 0 + c= 0
0 + c=0
c = 0
>>x² + y² + 2ax + 2by + c = 0 melalui (1,3)
1² + 3² + 2a x 1 + 2b x 3 + 0= 0
10 + 2a + 6b=0
2a+6b=-10 ....... (1)
>>x² + y² + 2ax + 2by + c = 0 melalui (5,-5)
5² + (-5)² + 2a x 5 + 2b x (-5) + 0= 0
50 + 10a -10b =0
10a-10b =-50
2a -5b = -10 ....... (2)
>> (1)&(2) eliminasi
11b=0
b=0
>> 2a +6x0 = -10
2a=-10
a=-5