Question

Решите систему уравнений методом подстановки -x+2y=4 7x-3y=5 срочно

Answer 1

$left { {{x+2y=4} atop {7x-3y=5}} right. ; left { {{x=4-2y} atop {7(4-2y)-3y=5}} right. ; left { {{x=4-2y} atop {28-14y-3y=5}} right. ; left { {{x=4-2y} atop {-17y=-23}} right. \\ left { {{x=4-2y} atop {y=frac{23}{17}}} right. ; left { {{x=4-frac{46}{17}} atop {y=frac{23}{17}}} right. ; left { {{x=frac{22}{17}} atop {y=frac{23}{17}}} right. ; left { {{x=1frac{5}{17}} atop {y=1frac{6}{17}}} right. \\Otvet:; ; (1 frac{5}{17} ; 1frac{6}{17} ); .$