Rozwiąż układ równań:
7x-y=4(2-5x)
3x+4y=5
7x-y=8-20x3x+4y=5
7x-y+20x=83x-4y=5
27x-y=83x-4y=5 /* (-9)27x-y=8-27x-36y=-45 +------------------------ -37y=-37y=13x+4*1=53x=5-43x=1x=1/3
27x-y=83x-4y=5 /* (-9)27x-y=8-27x-36y=-45 +__________________
-37y=-37y=13x+4*1=53x=5-43x=1x=1/3
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7x-y=8-20x
3x+4y=5
7x-y+20x=8
3x-4y=5
27x-y=8
3x-4y=5 /* (-9)
27x-y=8
-27x-36y=-45 +
------------------------
-37y=-37
y=1
3x+4*1=5
3x=5-4
3x=1
x=1/3
7x-y=8-20x
3x+4y=5
7x-y+20x=8
3x-4y=5
27x-y=8
3x-4y=5 /* (-9)
27x-y=8
-27x-36y=-45 +
__________________
-37y=-37
y=1
3x+4*1=5
3x=5-4
3x=1
x=1/3