2S+3T-1=0.(1)
4S-9T-8=0.(2)
(1)*2-(2),得
15T+6=0
15T=-6
T=-0.4
代入(1),得
2S+3*(-0.4)-1=0
2S-1.2-1=0
2S=2.2
S=1.1
所以
S=1.1,T=-0.4