Question

Решить систему уравнений: 5x-2y=11 4x-y=11

Answer 1

$left { {{5x-2y=11} atop {4x-y=11}} right. left { {{5x-2y=11} atop {-y=11-4x}} right. left { {{5x-2y=11} atop {y=4x-11}} right. 5x-2(4x-11)=11 5x-8x+22=11 -3x=11-22 -3x=-11 3x=11$
$x= frac{11}{3}= 3frac{2}{3}$
$5* frac{11}{3}-2y=11$
$18frac{1}{3}-2y=11;-2y=11- 18frac{1}{3};-2y= -7frac{1}{3};y= 3frac{2}{3}$
Ответ: $(3frac{2}{3}; 3frac{2}{3})$