Rozwiąż układy równań:
a) x + y = 2
x - y = 1
b) x + 2y = -½
3x + 4y = -1
_______________
2x=3
x=1,5
1,5+y=2
y=0,5
b) x + 2y = -½ |*(-2)
-2x-4y=1
3x+4y=-1
______________
x=0
0+2y=-1/2
2y=-1/2
y=-1/4
x + y + x - y = 3
2x = 3 /:2
x= 1,5
x + y = 2
y = 2 - 1,5
y= 0,5
x = -½ - 2y
3 ( -½ - 2y) + 4y = -1
-1,5 - 6y + 4y = - 1
-2y = 0,5 /: (-2)
y= - ¼
x + 2y = -½
x + 2 * (-¼) = -½
x = -½ +0,5
x= 0
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a) x + y = 2
x - y = 1
_______________
2x=3
x=1,5
1,5+y=2
y=0,5
x=1,5
y=0,5
b) x + 2y = -½ |*(-2)
3x + 4y = -1
-2x-4y=1
3x+4y=-1
______________
x=0
0+2y=-1/2
2y=-1/2
y=-1/4
x=0
y=-1/4
a) x + y = 2
x - y = 1
x + y + x - y = 3
2x = 3 /:2
x= 1,5
x + y = 2
y = 2 - 1,5
y= 0,5
b) x + 2y = -½
3x + 4y = -1
x = -½ - 2y
3 ( -½ - 2y) + 4y = -1
x = -½ - 2y
-1,5 - 6y + 4y = - 1
x = -½ - 2y
-2y = 0,5 /: (-2)
y= - ¼
x + 2y = -½
x + 2 * (-¼) = -½
x = -½ +0,5
x= 0