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Rezolvati sistemele:
a)3x+y=7
2x-y=8
b)3x-2y=7
x+3y=-5

Răspuns :

Nitugheorghe57
a)3x+y=7
2x-y=8⇒5x=15⇒x=15/5⇒x=3
3×3+y=7⇒9+y=7⇒y=-9+7⇒y=-2
b)3x-2y=7
x+3y=-5/-3⇒
3x-2y=7
-3x-9y=15⇒
-11y=22⇒y=22/-11⇒y=-2
3x+4=7⇒3x=7-4⇒3x=3⇒x=3/3⇒x=1
sucees

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