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x + y = 6
y = 6 - x
karena persamaan 1 memakai kuadrat, maka kita kuadratkan hasil substitusi persamaan 2 tadi.
y = 6² - x²
y = 36 - x² .........3
kita substitusi persamaan 3 ke persamaan 1 tadi.
x² - y² = 30
x² - (36 - x²) = 30
x² - 36 + x² = 30
2x² = 30 + 36
2x² = 66
x² = 33
x. = 5,744......4
kita substitusi persamaan 4 ke persamaan 2
x + y = 6
y = 6 - 5,744
y = 0,366