rozwiąż układ równań. x+ 2y =8 ,3x-4y=12
x + 2y = 8 |*23x - 4y = 12
2x + 4y = 163x - 4y= 12-------------------5x = 28 | ;5x=5.6
5.6 + 2y = 8
2y = 8 - 5.62y = 2.4 | ;2y = 1.2
x=5.6
y=1.2
x+2y=83x-4y=12
x=8-2y
3(8-2y)-4y=12
24-6y-4y=12
-10y=-12 :(-10)
y=1,2
x=8-2,4
x=5,6
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x + 2y = 8 |*2
3x - 4y = 12
2x + 4y = 16
3x - 4y= 12
-------------------
5x = 28 | ;5
x=5.6
5.6 + 2y = 8
2y = 8 - 5.6
2y = 2.4 | ;2
y = 1.2
x=5.6
y=1.2
x+2y=8
3x-4y=12
x=8-2y
3(8-2y)-4y=12
x=8-2y
24-6y-4y=12
x=8-2y
-10y=-12 :(-10)
x=8-2y
y=1,2
x=8-2,4
y=1,2
x=5,6
y=1,2