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acolada x+y=-6 pe x-3y=26

acolada 5x-y=7 pe x-y=3


Răspuns :

x+y=-6     
x-3y=26

y=-6-x
x-3(-6-x)=26
x+18+3x=26
4x=8
x=2
y=-6-2=-8

5x-y=7
x-y=3
y=5x-7
x-5x+7=3
4x=4
x=1
y=5*1-7=-2