20 points + Brainlest Determine if the following system of equations has no solutions, infinitely many solutions or exactly one solution.
-x+y=1
-2x -y=-4

One solution:(1,2)

Step-by-step explanation:

   y = x + 1

/Plug this in for variable  y  in equation [2]

  -2x - (x +1) = -4

  -3x = -3

Solve equation [2] for the variable  x  

 3x = 3  

    x = 1  

By now we know this much :

   x = 1

   y = x+1

Use the  x  value to solve for  y  

   y = (1)+1 = 2

Hope this helps :D please mark brainliest if correct

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation: