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5. Rezolvați sistemele: 2x-y 11 -3y=10 x + 3y 5 a) c) +2x=-7 x-y 3 2x-1 2y +1 + 7 3 = x + y ; = 0 ; b) d) x-3y_y-2 6 5 2x+1 y 3 7 3 x + y 4 x + y = 1_Y-x 2 3 1_y-x 5 || = 3 2 ==3 ;​

AM NEVOIE NEAPARAT!!!!!