rozwiąż układ równań metodą podstawiania lub przeciwnych współczynników:
a) 3x+2y=9
2x+y=7
b) 6x+7y=8
7x+9y=5
c) 2x+3y+18=0
3x+5y+29=0
d) 4x-3y= -1
5x+2y=45
e) 4(-2)-y=1
2x-4y=8
f) 2x+y=5
2x+y=7
g) a\3 + 6\5 =7
a\4 - 6\5 =0
h) 7x+7y=21
2x+5y+8=14
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a)( 3x+2y=9
( 2x+y=7
( 3x+2y=9
( y=7-2x
( 3x+2*(7-2x)=9
( y=7-2x
( 3x+14-4x=9
( y=7-2x
( 3x+4x=9-14
( y=7-2x
( -x=-5 /*(-1)
( y=7-2x
( x=5
( y=7-2x
(x=5
(y=7-2x
(x=5
(y=7-2*5
(x=5
(y=7-10
(x=5
(y=-3