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3x+y=5  2x-2y=-2 solving systems of equations

Sagot :

3x+y=5
2x-2y=-2
x+3y=7
x+3y-3y=7-3y
x=7-3y
3(7-3y)+y=5
21-9y+y=5
21-8y=5
21-21-8y=5-21
8y=-16
8y/8=-16/8
y=-2
x=7/3


Lilith
[tex]3x+y=5 \ \ /*2 \\ 2x-2y=-2 \\ \\ 6x+2y= 10\\ 2x-2y=-2 \\ + ----- \\8x=8 \ \ / :8\\x=1 \\ \\3*1+y=5 \\ y=5-3\\y=2\\ \\ Answer : \\ \\ x=1 \\ y=2[/tex]
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