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x+3y=7 / *(-2)
2x-5y=-8
-2x-6y=-14
-11y=-22 / :(-11)
y=2
x+3y=7 x=1
x+3*2=7 y=2
x+6=7
x=7-6 Odp. A ;))
x=1
x+3y=7
-5y=-8-2x
x=7-3y
-5y=-8-2(7-3y)
x=7-3y
-5y=-8-14+6y
x=7-3y
-5y-6y=-22
x=7-3y
-11y=-22 :/-11
x=7-3y
y=2
x=7-3*2
y=2
x=7-6
y=2
x=1
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odp.:
a)x=1,y=2