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4 x plus y egal cu 9 minus x plus 3 y egal cu 1​

Răspuns :

{4x+y=9

{-x+3y=1 /*4 =>

{4x+y=9

{-4x+12y=4

_________(+)

/ 13y=13

13y=13

y=1

4x+y=9

4x+1=9

4x=8 /:4

x=2

=> S={(2, 1)}

Kawaiimath