Odpowiedzi

2009-12-06T19:25:17+01:00
A)
2x+5y=7
3x-5y=3
_________
5x=10 /:5
x=2

2*2+5y=7
5y=7-4
5y=3 /:5
y=⅗

x=2
y=⅗

b)
x+y=2
x-y=0
_________
2x=2 /:2
x=1

1+y=2
y=1

x=1
y=1
2 3 2
2009-12-06T19:29:02+01:00
A) 2x + 5y = 7
3x - 5y = 3

5x = 10
x = 2

2x + 5y = 7
x = 2

2 * 2 + 5y = 7
x = 2

4 + 5y = 7
x = 2

5y = 7 - 4
5y = 3 / : 5

y = ⅗
x = 2

b) x + y = 2
x - y = 0

2x = 2 / :2
x = 1

x + y = 2
x = 1

1 + y = 2
x = 1

y = 2 - 1
x = 1

y = 1
x = 1
1 3 1