Rezolvati prin doua metode sistemul de ecuatii:
a)[tex] \left \{ {{ \frac{1}{2}x- \frac{1}{4} y=0 } \atop { \frac{1}{3}x+ \frac{2}{3}y=10 }} \right. [/tex]
b)[tex] \left \{ {{6x-8y=-2} \atop {5x+2y=1,8}} \right. [/tex]