Question

resuelve el sistena x+2y=1
-3x+y=-10​

Answer 1

x+2y=1. ==> x=1-2y

reemplazando en: -3x+y=-10

==> -3(1-2y)+y=-10

-3+6y+y=-10

7y=-7

y=-1

==> x=1-2y=1-2(-1)=1+2=3

x=3. y= -1