Question

1) Resolva as equações:
A) 4x-y=19
B) 2x+y=10
C) 3x+y=12
D) 4x-y=16
E) 5x+y=20

Answer 1

Resposta:

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Qual a sua pergunta?

milenamissu

20.08.2014

Matemática

Ensino fundamental (básico)

+5 pts

Respondido

{ 4x-y =3

{2x+3y=19

4x-y=3 (3)

2x+3y=19

12x-3y=9

2x+3y=19

14x=28

x=28/14

x=2

2x+3y=19

4+3y=19

3y=19-4

3y=15

y=15/3

y=5

B) {2x+y=10.(2)                              2x+y=10

{3x-2y=1                                    2.3+y=10

{4x+2y=20                                 6+y=10

{3x-2y=1                                       y=10-6

7x=21                                           y=4

x=21/7

x=3

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