(I) 2y-x=4
(II) 1/2y -4 =-1/2 x
Es gibt mehrere Lösungsvarianten
2y - x =4 | : 4
1/2 * y - x/4 = 1
1/2 *y - 4 = -1/2 x
1/2 * y = 1 + x/4
1/2 * y = 4 - 1/2 * x
1 + x/4 = 4 -1/2 * x
3 / 4 * x = 3
x = 4
2 * y - x = 4
2 * y - 4 = 4
y = 4
Probe
1/2 * y - 4 = - 1/2 * x
1/2 * 4 - y = - 1/2 * x
-2 = -2