Question

4n+3v = 14, 5n-3v=25; нарисуйте систему уравнений ​

Answer 1

$\displaystyle\bf\\+\left \{ {{4n+3v=14} \atop {5n-3v=25}} \right. \\---------\\9n=39\\\\n=39:9\\\\n=4\frac{1}{3} \\\\3v=14-4n=14-4\cdot4\frac{1}{3} =14-4\cdot\frac{13}{3}=14-17\frac{1}{3} =-3\frac{1}{3} \\\\\\v=-3\frac{1}{3} :3=-\frac{10}{3} \cdot\frac{1}{3} =-\frac{10}{9} =-1\frac{1}{9}\\\\\\Otvet \ : \ \Big(4\frac{1}{3} \ ; \ -1\frac{1}{9} \Big)$