Answer:
I think it's D
Step-by-step explanation:
 
        
             
        
        
        
Answer:
A. Matrix A
Step-by-step explanation:
When you put a systems of linear equations in matrix form, you take only the coefficients of the <em>xy </em>terms and sort them. <em>x</em> goes first, <em>y</em> comes after, and the numbers after the bars are the constants.
 
        
             
        
        
        
Answer:
x = 3
Step-by-step explanation:
the line doesn't have a slope
 
        
             
        
        
        
I'm taking the liberty of editing your function as follows:  <span>w=4r^2+6s^2, where I use " ^ " to indicate exponentiation.
The partial of w with respect to r is 8r.  That with respect to s is 12s.</span>