Rozwiąż układy równań:
a) x+2y=2
y-1=3x
b) -x-y=2
2(3x+y)=-20
c) 4x+3y=54
1/3x=4(1+1/8y)
Dam naj
x+2y=2
3x-y=-1/*2
6x-2y=-2 +
----------------
7x=0/:7
x=0
2y=2/:2
y=1
-x-y=2/*2
6x+2y=-20
-2x-2y=4
6x+2y=-20 +
-------------------
4x=-16/:4
x=-4
-24+2y=-20
2y=24-20
2y=4/:2
y=2
4x+3y=54
1/3x=4+1/2y
1/3x-1/2y=4/*6
2x-3y=24 +
-----------------
6x=78/:6
x=13
52+3y=54
3y=-52+54
3y=2/:3
y=2/3
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a) x+2y=2
y-1=3x
x+2y=2
3x-y=-1/*2
x+2y=2
6x-2y=-2 +
----------------
7x=0/:7
x=0
2y=2/:2
y=1
b) -x-y=2
2(3x+y)=-20
-x-y=2/*2
6x+2y=-20
-2x-2y=4
6x+2y=-20 +
-------------------
4x=-16/:4
x=-4
-24+2y=-20
2y=24-20
2y=4/:2
y=2
c) 4x+3y=54
1/3x=4(1+1/8y)
4x+3y=54
1/3x=4+1/2y
4x+3y=54
1/3x-1/2y=4/*6
4x+3y=54
2x-3y=24 +
-----------------
6x=78/:6
x=13
52+3y=54
3y=-52+54
3y=2/:3
y=2/3