Question

x+4y=25
x-3y=50
Помогите решить

Answer 1

x+4y=25
x-3y=50

x=25-4y
x-3y=50

25-4y-3y=50
-7y=25
y=25/(-7)
$y= - 3 \frac{4}{7}$
$x = 25 - 4 \times ( - 3 \frac{4}{7}) \\ x = 25 + 4 \times \frac{25}{7} \\ x = 25 + \frac{100}{7 } \\ x = \frac{175 - 100}{7} \\ x = \frac{75}{7} \\ x = 10 \frac{5}{7}$