Answer:
A sandwich costs $7.5
Step-by-step explanation:
Given
Represent chips with c and sandwiches with c


From the question, we understand that 5 sandwiches were ordered.
Hence, the question of the system is:

Substitute values for Total and c

Collect Like Terms


Divide both sides by 5


Answer:
first one
Step-by-step explanation: doesnt mention the number 8 variable anywhere
Answer:
D
Step-by-step explanation:
Given matrix allows you to write that

Let
From the last equation,

From the first equation,

Then the solution of the system has form

where t is any real number.