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2x + 2y = 6 /*(-2)
3x -4y =6
-4x -4y = -12
-x = -6 / : (-1)
x = 6
x= 6
2*6 + 2y = 6
x=6
2y = -6 /2
x=6
y= -3
b) - 5x - y = -3 / *2
-2x +2y = -6
-10x -2y = -6
-2x +2y = -6
-12x = -12 / : (-12)
x = 1
x=1
- 5*1 - y = -3
x=1
-y = 2 /:(-1)
x=1
y = -2
c) -x -5y =0
-5x -y = 0 /* (-5)
-x -5y =0
25x + 5y = 0
24x = 0 / :24
x= 0
x=0
-0 -5y =0
x=0
-5y=0
x=0
y=0<ale nie wiem czy to jest dobrze>
d) 3/4 x - 2/3y = 2
1/4x + 2/3y = 6
9/12x - 8/12y = 2 / *12
3/12x + 8/12y = 6/ *12
9x -8y = 24
3x + 8y = 72 / *(-1)
9x -8y = 24
-3x - 8y = -72
6x = -48 / :6
x = -8
x=-8
9* (-8) -8y = 24
x=-8
-8y = 96/ (-8)
x= -8
y= -12