Can someone pleaseeee help me with this pleasee! I appreciate if u do!! thank you!!
The and following system was solved by substitution, but there is a mistake in the
process. Identify which step contains the mistake, and explain how to fix it.
28) -5x-y=23
3x-y=-17 Use subtraction
Step 1: 2x + 5(x + 7) = 21
Step 2: 2x + 5x + 7 = 21
Step 3: 7x + 7 = 21
Step 4: 7x = 14
Step 5: x =2
Step 6: y=2+7
