Question

X + x + x = 30
x + y + y =20
y + 2z +2z = 9
y + z . x = ?

Answer 1

3x = 30 .•. x = 10

2y = 20-10 .•. y = 5

5 + 4z = 9 .•. z = 1

5 + 1 . 10 = 15

y + z . x = 15//

Answer 2

Explicação passo-a-passo:

x + x + x = 30

3x = 30

x = 30/3

x = 10

x + y + y = 20

10 + 2y = 20

2y = 20 - 10

2y = 10

y = 10/2

y = 5

y + 2z + 2z = 9

5 + 4z = 9

4z = 9 - 5

4z = 4

z = 4/4

z = 1

y + z . x = ?

5 + 1 . 10 = ?

5 + 10 = 15 ← RESPOSTA

att: S.S °^°