X=-1
Y=1
Z=1
Step-by-step explanation

Step 1
in order to eliminate y,
a))Mutiipy equation (3) by 5, then add the new equation to equation (1)

so
now, equation(1) by 2, added to equaiton (2) by 3

Step 2
now, use equation(4) and equation (5) to find x and z

a)in order to eliminate x, multiply equation (5) by 11, then add the result to equation(4)

hence
Z= 1
Step 3
now, replace the z value into equation(5) and isolate x

so
X=1
Step 4
finally, replace X and Z value into equation (1), then solve for x

therefore,
Y=1
so, the answer is
X=-1
Y=1
Z=1
I hope this helps you