Answer:
Step-by-step explanation:
x-y=-3
y=-3x+1
x-(-3x+1)=-3
x+3x-1=-3
4x=-3+1
4x=-2
x=-2/4
x=-1/2
y=-3(-1/2)+1
y=3/2+1
y=3/2+2/2
y=5/2
(x,y)=(-1/2,5/2)