HELP How does the subtraction
part of the expression change when a(b - c)
is expanded?

The variables change

Step-by-step explanation:

Since we can't subtract c from -b we multiply both variables by  a because the question is telling us to subtract b and c then multiply the awnser by a, but we don't know what b and c is so we just multiply b and c by a. In the end we get ab-ac

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

b, i believe, but not sure.