Question

Com a conta pfv...eu preciso ate as 16 horas

Answer 1

Resposta:

Explicação passo-a-passo:

a +2b = 7

-a +3b = 8

5b = 15

b = 15/5

b = 3

a +2b = 7

a + 2.3 = 7

a +6 = 7

a = 7-6

a = 1

3c -2d = 3

-2c +d = 1 .(2)

-4c +2d =2

-c = 5

c = 5 .(-1)

c = -5

3c -2d = 3

3.(-5) -2d = 3

-15 -2d = 3

-2d = 3 + 15

-d = 18/2

d = 9 .(-1)

d = -9

a = 1

b = 3

c = -5

d = -9