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18-02-2021
Mathematics

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is my answer correct, if now can you explain

is my answer correct if now can you explain class=

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18-02-2021

Yes. The first step is to set up the equations so that one unknown cancels out: here, the z's will cancel out:

5z+4y=-14

3z+6y=-6

-15z-12y=42

15z+30y=-30

8y=12

y=1.5

3z+6y=-6

3z+6(1.5)=-5-9

z=-14/3

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