Answer:
Infinite solutions
Explanation:
X + y =4
3x + 3y =12
Multiply the first equation by -3 to eliminate x
-3(X + y =4)
-3x-3y =-12
Now add this to the second equation
-3x-3y =-12
3x + 3y =12
----------------------
0=0
This is always true. That means there are infinite solutions.