Rozwiąż układ równań:a) b)
a)
I ze wzorów Cramera:
1]
2x-y=-7
4x+4+2y=18
y=2x+7
4x+2(2x+70=18-4
4x+4x=14-14
8x=0
x=0
..........
y=2×0+7=7
y=7
2]
(x-y)/2 - (y+3)/5 = x+2y /×10
(3-2x)/2 - (4y-2)/6=2- x/2 /×6
5x-5y-2y-6=10x+20y
6-4x-4y+2=12-3x
5x-10x-7y-20y=6
-4x+3x-4y=12-8
-5x-27y=6
-x-4y=4
x=-4y-4
-5(-4y-4)-27y=6
20y+20-27y=6
-7y=6-20
-7y= -14
y=14/7
y=2
.............
x=-4 ×2 -4
x=-12
y= 2
..............
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a)
I ze wzorów Cramera:
1]
2x-y=-7
4x+4+2y=18
y=2x+7
4x+2(2x+70=18-4
y=2x+7
4x+4x=14-14
y=2x+7
8x=0
x=0
..........
y=2×0+7=7
x=0
y=7
2]
(x-y)/2 - (y+3)/5 = x+2y /×10
(3-2x)/2 - (4y-2)/6=2- x/2 /×6
5x-5y-2y-6=10x+20y
6-4x-4y+2=12-3x
5x-10x-7y-20y=6
-4x+3x-4y=12-8
-5x-27y=6
-x-4y=4
x=-4y-4
-5(-4y-4)-27y=6
20y+20-27y=6
x=-4y-4
-7y=6-20
-7y= -14
y=14/7
y=2
.............
x=-4 ×2 -4
x=-12
y= 2
..............