De 2????−2????=???????? e −????+2????=????????,

� ???? − ???? =
1
2

????????

−???? + 2???? = ????????

???? =
1
2

???????? + ????????

De ???? = 1 2
3 −2 e ???? = 0 2
−1 4
,

???????? = −2 10
2 −2
e ???????? = 1 3
2 −2

Então,

???? =
1
2
⋅ −2 10
2 −2
+ 1 3
2 −2

???? = 0 8
3 −3

Substituindo ???? = 0 8
3 −3 e ???????? = 1 3
2 −2
na

equação −????+2????=????????,

−???? + 2 ⋅ 0 8
3 −3 = 1 3
2 −2

???? = −1 13
4 −4

Logo,

???????????? ???? + ???????????? ???? = −1 13
4 −4

+ 0 8
3 −3

???????????? ???? + ???????????? ???? = −1 ⋅ −4 − 13 ⋅ 4 + 0 ⋅ −3 − 8 ⋅ 3