Rozwiąż układ równań: 4(2x+3)-2(4y-1)=30 4(5x+1)-3(y-3)=36

4(2x+3)-2(4y-1)=30 4(5x+1)-3(y-3)=36 8x+12-8y+2 =30 /:2 20x+13 - 3y = 36 4x+7-4y = 15 20x-3y = 23 4x = 8+4y /:4 20x-3y = 23 x = 2+y 20(2+y) - 3y =23 x = 2+y 40+20y - 3y = 23 x = 2+y 17y = -17 x = 2+y y = -17/17 = -1 x = 1 y = -1