Himpunan penyelesaian dari
x + y -1 = 0
x² + y² - 25 = 0
adalah
x + y -1 = 0
x² + y² - 25 = 0
adalah
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(x + y)^2 = 1^2
x^2 + y^2 + 2xy = 1
substitusikan x^2 + y^2 + 2xy = 1 dan x^2 + y^2 = 25
2xy = -24
xy = -12
x + y = 1
x = 4 y = -3 atau x = -3 y = 4