There is no solution  for the first one
if you eliminate y   you get 2 equations
-13x - 13z = -25
-13x - 13x = -15    
- there is no solution to theses
a23  means the element in the second  row and the 3rd column
so its -5 
        
             
        
        
        
Answer:
Clara Barton- founder of the American Red Cross
Sally Tompkins- fought for equal pay
James Henry Gooding- established a war hospital 
Hope This Helps!     Have A Nice Night!!
 
        
                    
             
        
        
        
Notice the dependent and independent variables. X axis is usually the independent while y is the dependent. The dependent variable is affected by the independent one. Ravi is driving at a constant speed, which one looks like it is not changing in any direction whatsoever? But, Ravi is speeding up, so which one is adding the speeding (moving up) part of Ravi's driving? And finally, what graph also showcases the visual of Ravi slowing down after he was driving at a constant speed and then speeding up (hint: straight, up, down)?
        
             
        
        
        
Answer:
this is too hard which class are u in
 
        
             
        
        
        
Answer:
3,573
Step-by-step explanation:
 8 6(add it 81+6=87) 
 3 9 7
 x 9 Break it Up
------- 9x7=63
3 5 7 3 9x9=81
 9x3=27