Solve the system by using elementary row operations on the equations. Follow the systematic elimination procedure.
|
x1+5x2 |
= |
7 |
|
2x1+7x2 |
= |
5 |
|
Consider the accompanying matrix as the augmented matrix of a linear system. State in words the next two elementary row operations that should be performed in the process of solving the system. |
|
Question content area bottom
Part 1
What should be the first elementary row operation? performed? Select the correct choice below? and, if? necessary, fill in the answer box to complete your choice.
A.Replace row 2 by its sum with
enter your response here
times row 4.
?(Type an integer or a simplified? fraction.)
B.
Interchange row 3 and row 2.
C.Scale row 1 by
enter your response here.
?(Type an integer or a simplified? fraction.)
D.Replace row 4 by its sum with
enter your response here
times row 3.
?(Type an integer or a simplified? fraction.)