Berta worked to solve a system of equations.
4x + y = –5
x – y = –5
Step 1: ???
Step 2: x = –2
Step 3: 4(–2) + y = –5
Step 4: –8 + y = –5
Step 5: y = 3
Berta determined that the solution is (–2, 3).
Which could have been the equation Berta found in step 1?
4x = 0
5x = 10
5x = –10
5x = –25