Question 1056369
Solve using elimination:
X+2y=2
2x+3y-z=-9
4x+2y+5z=1
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Since the 1st eqn has no z term, eliminate that 1st.
<rev>
10x+15y-5z=-45 -- 2nd eqn times 5
4x +2y + 5z =1
------------------------ Add
14x + 17y = -44
</rev>
Now it's 2 eqns in x & y.
Can you do the rest?