Question

a) x-y=5
(x-y=5
1x+3y=9



b)3x – 2y = 6
x – 3y = 2




C) x+y = 4
2x+y = 7
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Answer 1

Resposta:

a) y=1 e x=6 ; b) y=0 e x=2 ; c) y=1 e x=3

Explicação passo-a-passo:

a) x-y = 5

x = 5+y

1.(5+y)+3y = 9

5+y+3y = 9

y+3y = 9-5

4y = 4

y = 4/4 = 1

x - 1 = 5

x = 5+1 = 6

b) x-3y = 2

x = 2+3y

3(2+3y)-2y = 6

6+9y-2y = 6

9y-2y = 6-6

7y = 0

y = 0/7 = 0

x - 3.0 = 2

x - 0 = 2

c) x+y = 4

x = 4-y

2.(4-y)+y = 7

8-2y+y = 7

-2y+y = 7-8 (-1)

2y-y = -7+8

y = 1

x+1 = 4

x = 4-1 = 3