Question 511574
add 3rd eqn to 1st eqn ___ -y + z = -2 (A)


multiply 3rd eqn by 4, then add to 2nd eqn ___ 9y - 7z = 24 (B)


multiply eqn (A) by 7, then add to eqn (B) ___ 2y = 10


substitute back the value of y to find x and z