4x- y = 18 |*2,5 5x + 2 i 1/2 y =30
10x-2,5y=45
5x+2,5y=30
-------------
15x=75
x=5
4*5-y=18
20-y=18
-y=18-20
-y=-2
y=2
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4x- y = 18 |*2,5
5x + 2 i 1/2 y =30
10x-2,5y=45
5x+2,5y=30
-------------
15x=75
x=5
4*5-y=18
20-y=18
-y=18-20
-y=-2
y=2
5x + 2 i 1/2y = 30 | * 4
- 20x +5y = - 90
20x + 10y = 120
15y = 30| :15
y = 2
4x - 2 = 18
4x=20
x=5
y=2
x=5