Equivalent expressions are expressions that have the same value.
The correct statement is: (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.
The systems of equations are:
System 1
Ax + By = C
Lx + My = N
When we add the System (1), we get:
Ax + By = C
Lx + My = N
_______________-
(Ax + Lx) + (By +My) = C + N
By distributive property and factor out x and y, we get:
⇒ (A + L)x + (B + M) y = C + N
The above equation is the first equation of system 2.
While Ax +By = C is the second equation of the system
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