Question

решите систему уравнений: {x-5y=-2
{2x+4y=28

Answer 1

x=-2+5y

2(-2+5y) +4y=28
-4+10y+4y=28
14y=32
y=32/14 =16/7=2 2/7
x=-2+5* 16/7 = -2+80/7 = -14/7+80/7 = 66/7 =9 3/7