Question

5 задача
Срочно помогите

Answer 1

Ответ:

$x=-5;\quad y=-4$

Пошаговое решение:

$\displaystyle \left \{ {{7x-10y=5} \atop {\displaystyle \frac{4x+1}{3}-\frac{5x-3y}{4}=3 }} \right. \Leftrightarrow\left \{ {{7x-10y=5} \atop {\displaystyle\frac{(16x+4)-(15x-9y)}{12}=3|*12 }} \right.$

$\displaystyle\left \{ {{y=0,5-0,7x} \atop {(16x+4)-(15x-9y)=36}} \right.$

$(16x+4)-(15x-9y)=36\\16x+4-15x+9(0,5-0,7x)=36\\16x-15x+4+4,5-6,3x=36\\x-6,3x+9,5=36\\-5,3x+9,5=36\\-5,3x=36-9,5\\-5,3x=26,5|:-5,3\\x=-5$

$7x-10y=5\\7*(-5)-10y=5\\-35-10y=5\\-10y=5+35\\-10y=40|:-10\\y=-4$