Question

Resolva os sistemas pelo método de comparação.​

Answer 1

Resposta:

11 ) a ) y = x + 3

y = 2x + 5

y = 2x + 5

x + 3 = 2x + 5

3 - 5 = 2x - x

-2 = x

x = -2

y = x + 3

y = -2 + 3

y = 1

y = x + 3

1 = -2 + 3

1 = 1

y = 2x + 5

1 = 2 × ( -2 ) + 5

1 = -4 + 5

1 = 1

b) y = 3

y = 2x + 5

3 = 2x + 5

-2x = 5 - 3

-2x = 2

-x = 2/2

-x = 1

x = -1

3 = 2 × ( -1 ) + 5

3 = -3 + 5

3 = 3

y = 2x + 5

3 = 2 × ( -1 ) + 5

3 = -2 + 5

3 = 3