1 rozwiąż układy równań metodą przeciwnych wspólczynników
a) (2x+5y=7
(3x-5y=3
b)
( x+y=2
(x-y=0
C)
(x+2y=9
(-x -3y = 5
d)
( -x +y =5
( x+y=5
e)
(2x-1,1y= o,7
( 0,5x +1,1y= 4,3
f )
(x-2y = 4
( - x +3y = 0
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a)2x+5y+3x-5y=7+3
5x=10 /5
x=2
b)x+y+x-y=2+0
2x=2 /2
x=1
c)x+2y-x-3y=9+5
-y=14 /(-1)
y=-14
d)-x+y+x+y=5+5
2y=10 /2
y=5
e)2x-1.1y+0.5x+1.1y=0.7+4.3
2.5x=5 /2.5
x=2
f)x-2y-x+3y=4+0
y=4