9s-13t=-12 s=2-3t 求s,t

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9s-13t=-12 s=2-3t 求s,t

9s-13t=-12 s=2-3t 求s,t
9s-13t=-12 s=2-3t 求s,t

9s-13t=-12 s=2-3t 求s,t
9(2-3t)-13t=-12;
18-27t-13t=-12;
-40t=-30
t=0.75;
s=2-3*0.75=-0.25

s=-1/4,t=3/4

t=0.75
s=-0.25

t=3/4,s=-1/4

s=-1/4
t=3/4