Solve the system using substitution

Question

y+x=3

3y+x=5

Answer 1

y=1

x=2

x+y=2+1=3

3y+x=3(1)+2=5

3y+x =5

y+x =3

subtract

2y =5-3=2

y = 2/2 =1

1+x =3

x =3-1=2

x=2, y=1