Question

Metodo de suma y resta
Problema
x-Y=-1
2x-3y=5

Answer 1

x-y=-1 .............l por (-3)
2x-3y=5 ......ll

-3x+3y = 3
2x-3y = 5
''''''''''"'""""""""
-x = 8
-8 = x ........(III)

III en I

x-y = 5
-8 -y = 5
-8-5 = Y
-13 = y

CS= (-13; -8)