rozwiaż układy równań ;
a) x+2
------minus 2y =5
5
y+2
x- ------ =3
6
b) x+y x
---- - --- =4
2 3
x-y + y =-3
---- ---
2 3
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a)
x+2/5-2y=5 /*5
x-y+2/6=3 /*6
x+2-10y=25
6x-y-2=18
x-y=23
6x-y=20 /*(-1)
x-y=23
-6x+y=-20
x=23+y
-6*(23+y)+y=-20
-138-6y+y=-20
-6y+y=-20+138
-5y=118 /:(-5)
y=-118/5
y=-23 3/5
x=23+(-23 3/5)
x=-3/5
y=-23 3/5
x=-3/5
b)
x+y/2-x/3=4 /*6
x-y/2+y/3=-3 /*6
3x+3y-2x=24
3x-3y+2y=-18
x+3y=24
3x-y=-18
x=24-3y
3*(24-3y)-y=-18
72-9y-y=-18
-9y-y=-18-72
-10y=-90 /:(-10)
y=9
x=24-3*9
x=24-27
x=-3
y=9
x=-3