Ionly have 2 questions i need with them plz i'll mark you as brainliest.

1. 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.

2. create an equivalent system of equations using the sum of the system and the first equation.

−3x + y = 12

x + 3y = 6

a.−3x + y = 12

−2x + 4y = 18

b. −3x + y = 12

−3x + 4y = 18

c.−3x + y = 12

x + 4y = 18

d.−3x + y = 12

−2x + 4y = 6