Question

me ajudem pleaseee!!!​

Answer 1

Explicação passo-a-passo:

{x + y = 23

{x.y = 102

x + y = 23

y = 23 - x

x.y = 102

x.(23 - x) = 102

23x - x² = 102

x² - 23x + 102

∆ = b² - 4ac

∆ = (-23)² - 4.1.102

∆ = 529 - 408

∆ = 121

x = - b ± √∆/2a

x = - (-23) ± √121/2.1

x = 23 ± 11/2

x' = 23+11/2 = 34/2 = 17

x" = 23-11/2 = 12/2 = 6

Sendo:

x' = x = 17

x" = y = 6

x = 17 e y = 6