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Najlepsza Odpowiedź!
2010-01-21T17:23:08+01:00
1
a) {6x-3y=9
x+5y=9
6x-3y = 9
x = 9-5
6(9-5)-3y = 9
x = 9-5
54-30-3y = 9
x=9-5
-3y=9-54+30
x=9-5
-3y= - 15 / (-3)
x=9-5
x= 4
y= 5
b)
3x+2y=13
2x+y=11
3x+2y = 13
y=11-2x
3x+22-4x = 13
y=11-2x
x = 9
y = 11-9
x=9
y=2

c)3x-y=5
5x-2y=7
-y = 5-3x
5x-2y = 7
y=-5+3x
5x+10 +6x = 7
y =
11x = -3
y =
x=3/11