a)
I SPOSÓB
3x + 2y =7x + 3y =5 |*(-3)
3x+2y=7
-3x-9y=-15
---------------
-7y=-8
y=8/7
x+24/7=5
x=35/7-24/7
y=8/7 1 1/7
x=11/7=1 4/7
II SPOSÓB
3x + 2y =7 |*3x + 3y =5 |*(-2)
9x+6y=21
-2x-6y=-10
------------
7x=11
x=11/7
11/7+3y=5
y=8/7=1 1/7
b)
x + 2y = 5 |*2-2x + 3y =4
2x+4y=10
-2x+3y=4
7y=14
y=2
x+4=5
x=1
b) x + 2y = 5 |*3-2x + 3y =4 |*(-2)
3x+6y=15
4x-6y=-8
-----------
7x=7
1+2y=5
2y=4
c)
4x -3y =6-2x +5y =8 |*2
4x-3y=6
-4x+10y=16
--------------
7y=22
y=22/7
4x-66/7=6
4x=42/7+66/7
4x=108/7
y=22/7=3 1/7
x=108/28=3 24/28=3 6/7
4x -3y =6 |*5 -2x +5y =8 |*3
20x-15y=30
-6x+15y=24
14x=54
x=54/14=27/7
x=27/7
-54/7+5y=8
5y=56/7+54/7
x=27/7=3 6/7
5y=110/7
x=3 6/7
y=110/35=3 1/7
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a)
I SPOSÓB
3x + 2y =7
x + 3y =5 |*(-3)
3x+2y=7
-3x-9y=-15
---------------
-7y=-8
y=8/7
y=8/7
x+24/7=5
y=8/7
x=35/7-24/7
y=8/7 1 1/7
x=11/7=1 4/7
II SPOSÓB
3x + 2y =7 |*3
x + 3y =5 |*(-2)
9x+6y=21
-2x-6y=-10
------------
7x=11
x=11/7
x=11/7
11/7+3y=5
x=11/7=1 4/7
y=8/7=1 1/7
b)
I SPOSÓB
x + 2y = 5 |*2
-2x + 3y =4
2x+4y=10
-2x+3y=4
------------
7y=14
y=2
y=2
x+4=5
y=2
x=1
II SPOSÓB
b) x + 2y = 5 |*3
-2x + 3y =4 |*(-2)
3x+6y=15
4x-6y=-8
-----------
7x=7
x=1
x=1
1+2y=5
x=1
2y=4
x=1
y=2
c)
I SPOSÓB
4x -3y =6
-2x +5y =8 |*2
4x-3y=6
-4x+10y=16
--------------
7y=22
y=22/7
y=22/7
4x-66/7=6
y=22/7
4x=42/7+66/7
y=22/7
4x=108/7
y=22/7=3 1/7
x=108/28=3 24/28=3 6/7
II SPOSÓB
4x -3y =6 |*5
-2x +5y =8 |*3
20x-15y=30
-6x+15y=24
--------------
14x=54
x=54/14=27/7
x=27/7
-54/7+5y=8
x=27/7
5y=56/7+54/7
x=27/7=3 6/7
5y=110/7
x=3 6/7
y=110/35=3 1/7