[latex] \left \{ {{ \frac{x+7}{3}- \frac{y-8}{5} =3,} \atop { \frac{x+5}{4}+ \frac{y+9}{3} =5.}} \right. [/latex]

Question

[latex] \left \{ {{ \frac{x+7}{3}- \frac{y-8}{5} =3,} \atop { \frac{x+5}{4}+ \frac{y+9}{3} =5.}} \right. [/latex]

Математика

[latex] \left \{ {{ \frac{x+7}{3}- \frac{y-8}{5} =3,} \atop { \frac{x+5}{4}+ \frac{y+9}{3} =5.}} \right. [/latex]

Гость

Ответ(ы) на вопрос:

Accepted Answer

5(x+7)-3(y-8)=3*15 5x+35-3y+24=45 5x-3y=45-35-24 3*(x+5)+4*(y+9)=5*12 3x+15+4y+36=60 3x+4y=60-15-36 5x-3y=-14 /*3 15x-9y=-42 3x+4y=9 /*5 15x+20y=45 -29y=-87 y=-87:(-29) y=3 5x-3*3=-14 5x-9=-14 5x=-14+9 5x=-5 x=-1 ответ (-1 ;3)