Odpowiedzi

2010-03-13T21:29:47+01:00
2x-5y=-8
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
2010-03-13T21:29:58+01:00
2x-5y=-8
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