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explain how system 1 becomes equivalent to system 2.

system 1:
lx + my = n
ax + by = c

system 2:
(l − a)x + (m − b)y = n − c
lx + my = n

a. the first equation in system 2 is the sum of the equations in system 1. the second equation in system 2 is the first equation in system 1.

b. the first equation in system 1 is the difference of the equations in system 2. the second equation in system 1 is the first equation in system 2.

c. the first equation in system 2 is the difference of the equations in system 1. the second equation in system 2 is the first equation in system 1.

d. the first equation in system 1 is the sum of the equations in system 2. the second equation in system 1 is the first equation in system 2.