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x-3y=5
2x-y=3
x=5+3y
2*(5+2y) -y=3
x=5+3y
10+4y-y=3
x=5+3y
3y=3-10
x=5+3y
y=-7/3
x=5+3*(-7/3)
x=-2
3x=-1 /:3
x=-⅓
Rozwiąz układ rownan
x-3y=5 /×(-2)
2x-y=3
-2x+6y=-10
2x-y=3
5y=-7 /:5
y=-1⅖
-2x+6y=-10
2x-y=3 /×6
-2x+6y=-10
12x-6y=18
10x=8 /:10
x=⅘
Rozwiąż nierównosc xkwadrat +6-7 mniejsze badz rowne 0
x²+6-7≤0
x²-1≤0 /+1
x²≤1 /√
x≤√1
1=3x/:3
⅓=x
uklad rownan:
x-3y=5/×-2 x-3×-1.4=5
2x-y=3 x-4.2=5
x=0.8
-2x+6y=-10 y=-1.4
2x-y=3
5y=-7/:5
y=-1.4