Question

calcule os valores de A/B/C/D

Answer 1

Vamos lá:

a + b = 9
b + c = -1
2b = 6
2a - 3d = 18

2b = 6
b = 6/2
b = 3

a + b = 9
a + 3 = 9
a = 9 - 3
a = 6

b + c = -1
3 + c = -1
c = -1 - 3
c = -4

2a - 3d = 18
2.6 - 3d = 18
12 - 3d = 18
-3d = 18 - 12
-3d = 6
3d = -6
d = -6/3
d = -2

a = 6; b = 3; c = -4; d = -2

Espero ter ajudado