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:

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles