Question

x+y=1
3x-y=3
como resolvo esse sistema

Answer 1

X+y=1
3x-y=3

X=1-y

3(1-y)-y=3
3-3y-y=3
-4y=0
Y= 0

X=1 -y
X= 1-0
X=1


1+0=1

3.1+0=3