Answer:
A. Only Khaled
Step-by-step explanation:
The teachers equation is:
[tex]-10x-7y=5[/tex]
[tex]12x-8y=-4[/tex]
If a row operation on the teacher's equation results in any of the system of the students' equation then the two systems are equivalent and will have the same solution.
For instance:
Let's maintain the bottom equation and add both equation to replace the top equation:
[tex]-10x+12x-7y-8y=5+-4\\12x-8y=-4[/tex]
This results in Khaled's equation:
[tex]2x-15y=1\\12x-8y=-4[/tex]
On the other hand we cannot perform a row operation to obtain Miku's equation
