Answer:
In the procedure
Step-by-step explanation:
we have
System 1
Ax+By=C -----> equation A
Lx+My=N -----> equation B
step 1
Adds equation A and equation B
Ax+By=C
Lx+My=N
----------------
Ax+Lx+By+My=C+N
(A+L)x+(B+M)y=C+N -----> equation C
step 2
An equivalent system (System 2) is formed with equation C and equation A
(A+L)x+(B+M)y=C+N -----> equation C
Ax+By=C -----> equation A