Answer:
infinitely many solutions
Explanation:
2x -y =5
1 = y - 2x +5 minus 5 from both sides
-5. -5
-4 = y - 2x add 2x to both sides
+2x = +2x
2x - 4 = y substitute y = 2x -4 in the 1st equation
2x - (2x - 4) = 5
2x -2x + 4 = 5
infinitely many solutions