<PRE><B>Question 160344</B>
reduce (simplify) where you can __ dividing 3rd eqn by 3 gives a NEW 3rd eqn __ x-2y+z=17


new 3rd eqn times 10, added to 1st eqn __ -x-23y=187 __ -23y-187=x


new 3rd eqn times -2, added to 2nd eqn __ -14x-y=50


substituting __ -14(-23y-187)-y=50 __ 321y=-2568 __ y=-8


substituting __ -23(-8)-187=x __ -3=x


substituting __ (-3)-2(-8)+z=17 __ z=4</PRE>