book Maths Puzzle Numerical Ability

TWO TRAINS LEFT THE SAME STATION AT THE SAME TIME. MARINO'S TRAIN WAS TRAVELING DUE NORTH AT A SPEED THAT WAS 10 MPH FASTER THAN THE KRYSTLE TRAIN, WHICH WAS TRAVELING DUE EAST. AF

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how do u solve these linear systems by gauss elimination or any other method?

x -5y +0z +10w= 27
5x -25y +10z -4w= -47
10x +2y -1z +4w= 36
2x +4y -2z +0w= 12

Thank you very much I appreciate your help. can you please help me with {x+12y=68
{x=8y-12