Question

помогите решить систему уравнений

Answer 1

$\left \{ {{ \frac{x+7}{3} - \frac{y-8}{5} = 3} \atop { \frac{x+5}{4}+ \frac{y+9}{3}=5 }} \right. \\ \left \{ {{5*(x+7)-3*(y-8)=15*3} \atop {3*(x+5)+4*(y+9)=12*5}} \right. /rascroem \\ \left \{ {{5x+35-3y+24=45} \atop {3x+15+4y+36=60}} \right. \\ \left \{ {{5x-3y+59=45} \atop {3x+4y+51=60}} \right. \\ \left \{ {{5x=45-59+3y} \atop {3x+4y=60-51}} \right. \\ \left \{ {{5x=3y-14} \atop {[tex] \left \{ {{y=3} \atop {3x+4y=9}} \right. \\ \left \{ {{y=3} \atop {3x+4*3=9}} \right. \\ \left \{ {{y=3} \atop {3x=9-12}} \right. \\ \left \{ {{y=3} \atop {3x=-3}} \right. \\ \left \{ {{y=3} \atop {x=-1}} \right.$}} \right. \\ \left \{ {{x=0.6y-2.8} \atop {3*(0.6y-2.8)+4y=9}} \right. [/tex] \\ \left$3*(0.6y-2.8)+4y=9 \\ 1.8y-8.4+4y=9 \\ 5.8y=17.4 \\ y=3$