Answer:
sln
3x-y=-3
3x-y=-3(make subject x)
3x=-3+y(divided by 3 both sides)
x=(-3+y) /3,x=-1+y /3
find y
3x-y=-3
-y=-3-3x(put the value of x)
-y=-3-3(-1+y/3)
-y=-6(-1+y/3)
-y=6+y/3
-y-y/3 =-3
-4y/3=-3(X by 3 both sides)
--4y=-6(divided by - 4 both sides)
y=1.5
find x
3x-y= -3 (put the value of y)
3x-1.5= -3
3x=-3+1.5
3x=-1.5(divided by 3 both sides)
x=-0. 5