[tex]x\to nr. \ pasarilor \\ y\to nr. \ viteilor \\\\ \left \{ {{x+y=115} \ |(-2) \atop {2x+4y=260}} \right. \\\\\\ \left \{ {{-2x-2y=-230} \atop {2x+4y=260}} \right. \\========== \\ / \ \ \ 2y=30 \ |:2 \\\\ \boxed{y=15} \\\\ x+y=115 \\\\ x=115-y \\\\ x=115-15 \\\\ \boxed{x=100}[/tex]
OR
[tex]x \to nr. \ pasarilor \\ y \to nr. \ viteilor \\\\ x+y=115 \ \ \ \ \to \boxed{x=115-y} \\\\\\ 2x+4y=260 \\\\ 2(115-y)+4y=260 \\\\ 230-2y+4y=260 \\\\ 2y=260-230 \\\\ 2y=30 \ |:2 \\\\ \boxed{\boxed{y=15}} \\\\ x=115-15 \\\\\\ \boxed{\boxed{x=100}}[/tex]
