math

-4s+4t=-2 2s+t=1 2s+4t=2

 

2s=1-t    and    2s=2-4t

so

1-t=2-4t

1+3t=2

3t=1

t=1/3

 

2s+1/3 = 1

6s+1=3

6s=2

s=1/3

 

This makes equation 2 and 3 true.  I have not used equation 1 at all but I will check it now.

 

-4*1/3 +4*1/3 = 0 NOT -2

So the three lines are not  concurrent.  They do not all intersect at the same place.

So there is no solution.