zad 5/83 zz podr 2 kl. matematyka wokół nas
d) 2y-1 2x+1 -y-x x+y
------ - ------ = ------ + ------
4 6 3 2
x/3 + y/2 = -1
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d) 2y-1 2x+1 -y-x x+y
------ - ------ = ------ + ------ || ×12
4 6 3 2
3(2y-1) - 2(2x+1) = 4(-y-x) + 6(x+y)
6y - 3 - 4x - 2 = -4y -4x + 6x + 6y
6y - 6y - 4y - 4x + 4x - 6x = 3 + 2
-4y -6x = 5
x/3 + y/2 = -1
y/2 = -1 - x/3 || ×2
y = -2 - 2x/3
wracamy do poprzedniego:
-4y -6x = 5
-4 (-2 - 2x/3) - 6x = 5
8 + 8x/3 - 6x = 5
8x/3 - 18x/3 = 5 - 8
-10x/3 = -3 || × (-3)
10x = 9
x = 9/10