The (3, 1/5) would be a solution while the (-1,1) wouldn’t because when you write this equation in the slope intercept form which is y = 3/5x - 8/5 
1/5 = 3/5 (3) - 8/5 
would end up with 1/5 = 1/5 which is write 
While,
1 = 3/5 (-1) - 8/5 
Would end up with 
1 = 11/5 which is wrong 
        
             
        
        
        
X=3
X/-3 = -1 ,Leave X by itself so multiply by -3 on both sides.
X = -1*-3
X = 3, negative times negative equals positive.
        
                    
             
        
        
        
The directions say round to the nearest tenth so use the 8.8 cm