Question

Ñ conseguir fazer isso

Answer 1

Ola Eloise

a + b = 7  (I)
3c - 2d = 8 (II)
-a + 3b = 8 (III)
-2c + d = -1  (IV)

(I + II
4b = 15
b = 15/4
a = 7 - b
a = (28 - 15)/4 = 13/4

3c - 2d = 8 (II)
-4c + 2d = -2 (IV)
-c = 6
c = -6
-18 - 2d = 8
2d = -26
d = -13

S = ((a, b, c, d) (13/4, 15/4, -6, -13))