Rozwiąż używając wzorów skróconego mnożenia oraz delty.
x + y = 7
x² - y² = 7
x = 7 - y
(7-y)² - y² = 7
49 - 14y + y² - y² = 7
-14y = -42
y = 3
x = 4
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x + y = 7
x² - y² = 7
x = 7 - y
(7-y)² - y² = 7
x = 7 - y
49 - 14y + y² - y² = 7
x = 7 - y
-14y = -42
x = 7 - y
y = 3
x = 4
y = 3