Question

Qual o valor de X e Y do sistema abaixo?

X - Y = 10
X + Y = 44

A) x=25, y=15
B) x=25, y=25
C) x=15, y=25
D) x=215, y=15

Answer 1

X - Y = 10

X + Y = 44 (Corte -Y com Y)

________

X + X = 10 + 44

2x = 54

X = 54/2

X = 27

X - Y = 10

27 - Y = 10

27 - 10 = Y

Y = 17

Answer 2

Resposta:

Junta as duas contas

X - Y + X + Y = 44 +10

2x=54

x = 54/2

x= 27 ( 27 × 2 = 54 )