I'm guessing on the make up of the matrices.
 First off let's look at [C][F].
 [C]=
 [F]=
 [C][F]=
 where each element of [C][F] comes from multiplying a row of [C] with a column of [F].
 Example: First element is product of first row and first column.
 .
 .
 .
 Now that we have [C][F], we can subtract it from [B], element by element,
 [B]-[C][F]=
 [B]-[C][F]=
 .
 .
 .
 If this is not how the matrices look,please re-state the problem and be more specific about the make up of the matrices (rows x columns).
 Here's an example.
 [A] is a 2x2 matrix. A=[1,2,3,4].
 The assumption is that [A] looks like this,
 [A]=
 [B] is a 3x2 matrix. B=[5,6,7,8,9,10]
 [B]= 
  
        
             
        
        
        
Answer:
y = - 2x + 12
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
Here m = - 2, thus
y = - 2x + c ← is the partial equation
To find c substitute (5, 2) into the partial equation
2 = - 10 + c ⇒ c = 2 + 10 = 12
y = - 2x + 12 ← equation of line
 
        
             
        
        
        
.58. Absolute value gets rid of negative.