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3x+2y = 17 | x 2 | 6x + 4y = 34
2x-3y = -6 | x 3 | 6x - 9y = -18
----------------------(-)
13y = 52
y = 4
2x - 3y = -6
2x - 3(4) = -6
2x = -6+12
2x = 6
x = 3
r² = x²+y²
= 3² + 4²
= 9 + 16
= 25
persm. lingkaran
x²+y²=r²
x²+y²=25