Question

resuelve por sustitucion
{x+y=5
{2x+3y=13

Answer 1

de la 1
y=5-x
en 2
2x+3(5-x)=13
2x+15-3x=13
2x-3x=13-15
-(-x=-2
x=2

y=5-x
y=5-2
y=3

Answer 2

y=5-x
2x+3y=13
2x+3(5-x)=13
2x+15-3x=13
-x=-2
x=2