Rozwiąż układ równan:
4x+6y=14
2(x-1)=2+3(1-y)
(x-3)(y-2)=(x-2)(y-3)+0,5
(x+3)²-(x-2)²=y(y-4)-y²-10
2x+y=5
(x-1)(x+2)=(x-1)(x+7)
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1)
4x+6y=14
2x+3y=7/*(-2)
4x+6y=14
-4x-6y=-14
0=0
a)
4x+6y=14
2(x-1)=2+3(1-y)
4x+6y=14
2x-2=2+3-3y
4x+6y=14
2x+3y=7/* (-2)
4x+6y=14
-4x-6y=-14
0=0
układ nieoznaczony
b)
(x-3)(y-2)=(x-2)(y-3)+0,5
(x+3)²-(x-2)²=y(y-4)-y²-10
xy-2x-3y+6=xy-3x-2y+6+0,5
x^2+6x+9-x^2+4x-4=y^2-4y-y^2
-2x-3y+6+3x+2y=6,5
10x+4y=-5
x-y=0,5/*4
10x+4y=-5
4x-4y=2
10x+4y=-5
14x= -3
10x+4y=-5
x=-3/14
10*(-3/14) +4y=-5
x=-3/14
-15/7+4y=-5
x=-3/14
4y=-20/7
x=-3/14
y=-5/7
c)
2x+y=5
(x-1)(x+2)=(x-1)(x+7)
2x+y=5
x^2+2x-x-2=x^2+7x-x-7
2x+y=5
x-6x=-5
2x+y=5
-5x=-5
2x+y=5
-x=-1
2x+y=5
x=1
2*1+y=5
x=1
y=5-2
x=1
y=3
x=1