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bilangan kedua = y
x + y = 2
5 + 2x = -1
2x = -1 - 5
2x = -6
x = -6 / 2
x = -3
x + y = 2
-3 + y = 2
y = 2 + 3
y = 5
x^2 + y^2
= (-3)^2 + 5^2
= 9 + 25
= 34 (b)