Rozwiąż układy równań metodą przeciwynych współczynników.
i to jest w klamerce. ;)
x-y = 5
3x+4y=8
2x-3y=-5
-x+5y=6
x-y = 5 /*(-3)
-3x+3y=-15
_____________
7y=-7 /:7
y=-1
x-y = 5 /*4
4x-4y=20
__________
7x=28 /:7
x=4
-x+5y=6 /*2
-2x+10y=12
____________
7y=7 /:7
y=1
2x-3y=-5 /*5
-x+5y=6 /*3
10x-15y=-25
-3x+15y=18
7x=-7 /:7
x=-1
x-y = 5 /*(-3)3x+4y=8
-------------- +
7y=-7/:7
3x-4=8
3x=8+4
3x=12/:3
2.
-x+5y=6 /*(-2)
-2x-10y=-12
--------------- +
-13y=-17/:(-13)
y=17/13
y=1 i 4/13
-x+5*17/13=-12
-x+85/13=-12
-x=-12-6 7/13
-x=-18 7/13 /*(-1)
x=18 7/13
y=1 4/13
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x-y = 5 /*(-3)
3x+4y=8
-3x+3y=-15
3x+4y=8
_____________
7y=-7 /:7
y=-1
x-y = 5 /*4
3x+4y=8
4x-4y=20
3x+4y=8
__________
7x=28 /:7
x=4
2x-3y=-5
-x+5y=6 /*2
2x-3y=-5
-2x+10y=12
____________
7y=7 /:7
y=1
2x-3y=-5 /*5
-x+5y=6 /*3
10x-15y=-25
-3x+15y=18
____________
7x=-7 /:7
x=-1
x-y = 5 /*(-3)
3x+4y=8
-3x+3y=-15
3x+4y=8
-------------- +
7y=-7/:7
y=-1
3x+4y=8
3x-4=8
3x=8+4
3x=12/:3
x=4
x=4
y=-1
2.
2x-3y=-5
-x+5y=6 /*(-2)
2x-3y=-5
-2x-10y=-12
--------------- +
-13y=-17/:(-13)
y=17/13
y=1 i 4/13
-x+5y=6
-x+5*17/13=-12
-x+85/13=-12
-x=-12-6 7/13
-x=-18 7/13 /*(-1)
x=18 7/13
x=18 7/13
y=1 4/13