Question

Решите систему уравнений
$left { {{5x-14y=6,5} atop {x-2,8y=1,3}} right.$

Answer 1

5x-14y=6.5
x-2.8y=1.3            *-5

5x-14y=6.5
-4x+14y=-6.5

x=0
0-2.8y=1.3
y=13/10 * -10/28 =  -13/28