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e)4x-2y=6 3x+6y=12 f)3x-4y=14 -2x+7y=-18
1.
4x-2y=6
3x+6y=12/:3
x+2y=4
5x=10
x=2
8-2y=6
-2y=-2
y=1
2.
3x-4y=14/·2
-2x+7y=-18/·3
6x-8y=28
-6x+21y=-54
13y=-26
y=-2
3x-4·(-2)=14
3x=6
e)
4x - 2y = 6 /·3
3x + 6y = 12
12x - 6y = 18
-----------------
15x = 30 /:15
x = 2
4 · 2 - 2y = 6
8 - 2y = 6
-2y = 6 - 8
-2y = -2 /:(-2)
y = 1
f)
3x - 4y = 14 /·2
-2x + 7y = -18 /·3
6x - 8y = 28
-6x + 21y = -54
----------------------
13y = -26 /:13
y = -2
3x - 4 · (-2) = 14
3x + 8 = 14
3x = 14 - 8
3x = 6 /:3
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1.
4x-2y=6
3x+6y=12/:3
4x-2y=6
x+2y=4
5x=10
x=2
8-2y=6
-2y=-2
y=1
2.
3x-4y=14/·2
-2x+7y=-18/·3
6x-8y=28
-6x+21y=-54
13y=-26
y=-2
3x-4·(-2)=14
3x=6
x=2
e)
4x - 2y = 6 /·3
3x + 6y = 12
12x - 6y = 18
3x + 6y = 12
-----------------
15x = 30 /:15
x = 2
4 · 2 - 2y = 6
8 - 2y = 6
-2y = 6 - 8
-2y = -2 /:(-2)
y = 1
x=2
y=1
f)
3x - 4y = 14 /·2
-2x + 7y = -18 /·3
6x - 8y = 28
-6x + 21y = -54
----------------------
13y = -26 /:13
y = -2
3x - 4 · (-2) = 14
3x + 8 = 14
3x = 14 - 8
3x = 6 /:3
x = 2
y = -2
x = 2