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pers grs singgung
x1 .x + y1 .y = r²
- 3 .x + 1 .y = 10
- 3x + y = 10 .. atau 3x - y + 10 = 0
b) x1 .x + y1 .y = r²
4 .x + 2√5 .y = 36
4x + 2√5 y = 36