Question

{-x+4y=27
{3(x+4)/5 - y+5/2=
-3

Answer 1

Ola Selthon

-x + 4y = 27

3*(x + 4)/5 - (y + 5)/2 = -3 

6*(x + 4)/10 - 5(y + 5)/10 = -30/10 

6x + 24 - 5y - 25 = -30

6x - 5y = -30 + 1

sistema

-x + 4y = 27
6x - 5y = -29 

-6x + 24y = 162
6x - 5y = -29

19y = 133
y = 133/19 = 7 

-x + 4y = 27
-x + 28 = 27
x = 28 - 27 = 1

S = (1, 7)