Odpowiedź:
[tex]\left \{ {{x+\frac{1}{2}y =8} \atop {\frac{1}{2} x-\frac{3}{4}y =-4}} \right.[/tex]
[tex]\left \{ {{x = 8 - \frac{1}{2}y } \atop {\frac{1}{2}*(8 - \frac{1}{2}y) - \frac{3}{4}y = -4}} \right.[/tex]
4 - [tex]\frac{1}{4} y[/tex] - [tex]\frac{3}{4} y[/tex] = -4
- [tex]\frac{4}{4} y[/tex] = - 4 -4
-y = - 8
y = 8
x = 8 - [tex]\frac{1}{2} y[/tex]
x = 8 - [tex]\frac{1}{2} * 8[/tex] = 8 -4 = 4
[tex]\left \{ {{x=4} \atop {y=8}} \right.[/tex]
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