Explain how system 1 becomes equivalent to system 2.
system 1:
ax + by = c
lx + my=n
system 2:
(a + l)x + (8 + m)y = c+n
ax + by = c
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 2 is the difference of the equations in system 1. the second equation in system 2 is the first equation in system 1.
c. the first equation in system 1 is the sum of the equations in system 2. the second equation in system 1 is the second equation in system 2.
d. the first equation in system 1 is the difference of the equations in system 2. the second equation in system 1 is the second equation in system 2.

Equivalent expressions are expressions that have the same value.

The true 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

System 2

When the equations of system 1 are added, we have:

Factor out x and y

The above equation is the first equation of system 2.

While is the second equation of the system

Hence, the true statement is (a)

Read more about systems of equations at:

link

Step-by-step explanation:

-3.5 degrees per hour

step-by-step explanation:

find the unit rate:

-12   1/4 degrees           12.25 degrees

= - = -3.5 degrees per hour

      3   1/2 hours               3.5 hours