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zloy xaker [14]
3 years ago
11

Equation P: y + z = 4

Mathematics
1 answer:
Eduardwww [97]3 years ago
4 0
y+z=4\\
3y+7z=15\\

-3y-3z=-12\\
3y+7z=-12\\
4z=-24\\
z=-6

Multiply the top equation by -3 and added to the second one.

By Elimination.

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