Question

Comparação de {x+y=22 {4x+y=74

Answer 1

/ x + y = 22 ==> y = 22 - x
\ 4x + y = 74 ==> y = 74 - 4x

22 - x = 74 - 4x
- x + 4x = 74 - 22
3x = 52
x = 52/3

x + y = 22
52/3 + y = 22
y = 22 - 52/3
y = (66 - 52) / 3
y = 14/3