Book Maths Puzzle Algebra

y+x=2
2x+y=8

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Book Other Question

Arif's backyard is 20 m by 30 m. He wants to put a flower garden in the middle of the backyard, leaving a strip of grass of uniform width around the flower garden. Arif must have How do I solve this system of linear equation in three variables?

-2x+2y+z= 15
2x+ y-2z= -14
3x-4y-3z= -32