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y = 2 - x | + x
0,5x + 2y = 1
x + y = 2 | * (-2)
0,5x + 2y = 1
+ - 2 x - 2y = -4
------------------------------
-1,5x = -3 | * (-1,5)
x = 2
0,5 * 2 + 2y = 1
1 + 2y = 1 | -1
2y = 0 | :2
y = 0
x = 2
y = 0
e) y = 6x + 2 |
3 - y/2 + 3x = 0 | * 2
-6x + y = 2
6 - y + 6x = 0 | -6
-6x + y = 2
+ 6x - y = -6
--------------------------
0 = -4
PS Wszystko jest idealnie zrobione i z góry dziekuje za naj :))