Question

РЕШИТЕ СИСТЕМУ УРАВНЕНИЙ
x-2y=-8
x/4+y-2/3=-1

Answer 1

$left { {{x-2y=-8} atop { frac{x}{4}+y- frac{2}{3}=-1}} right. \ \ left { {{x=2y-8} atop {frac{3x+12y-8}{12}=-1}} right. \ \ left { {{x=2y-8} atop {3x+12y-8=-12}} right. \ \ left { {{x=2y-8} atop {3x+12y=8-12}} right. \ \ left { {{x=2y-8} atop {3x+12y=-4}} right. \ \ 3(2y-8)+12y=-4 \ 6y-24+12y=-4 \ 18y=20 \ y= frac{20}{18} = frac{10}{9} =1 frac{1}{9} \ \ x=2(frac{10}{9})-8=frac{20-72}{9}=- frac{52}{9} =-5 frac{7}{9}$