Question

Друзья, выручайте! Спасибо заранее)

Answer 1

$\left \{ {{y=x+3} \atop {x+y=-7}} \right.\; \; \left \{ {{y=x+3} \atop {y=-x-7}} \right.\; \; \left \{ {{y=x+3\quad } \atop {x+3=-x-7}} \right.\; \; \left \{ {{y=x+3} \atop {2x=-10}} \right.\; \; \left \{ {{y=-2} \atop {x=-5}} \right.\; \; \to \; \; M(-5,-2)\\\\A(-3,5)\in l\; ,\; \; M(-5,-2)\in l\\\\l:\; \frac{x+3}{-5+3}=\frac{y-5}{-2-5}\; \; ,\; \; \frac{x+3}{-2}=\frac{y-5}{-7}\\\\-7x-21=-2y+10\\\\l:\; 7x-2y+31=0\\\\l:\; y=3,5x+15,5$