Question

x² - y² = 24
x - y = 12

x + y =??
x = ???
y = ???

daaauuuu coroanaaa ​

Answer 1

Răspuns:

x + y = 2

x = 7  

y = - 5

Explicație pas cu pas:

x² - y² = 24

x - y = 12

x² - y² = (x + y)(x - y)

24 = (x + y) × 12

x + y = 24 : 12

x + y = 2

x - y = 12

2x = 14

x = 14 : 2

x = 7

7 - y = 12

y = 12 - 7

y = - 5

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