It’s B 
If y-x=6
 Y +X =_10 
then y= 6 + x, instead of y insert this no 
6+ x+ x =-10
6 + 2x =-10 then collect like terms 
2x =-10-6
2x=-16 then multiple both side by 1/2
X=-8 
Y=6+x instead of x insert -8
Y=6-8
=-2
        
             
        
        
        
Answer:
Step-by-step explanation:
Total number of students who roller skated = 80
Number of students who roller skated with laser tag = 39
Number of students who roller skated with no laser tag = 80 - 39 = 41
Therefore, percentage of students who roller skated with no laser tag =  = 27%
 = 27%
Since, number of students who played laser tag = 85
Percentage of students who played laser tag =  = 55%
 = 55%
Total number of students who played no laser tag = 45% of 154 = 69 
Number of students with no roller skates and no laser tag = 69 - 41 = 28
Percentage of students with no roller skates and no laser tag =  
        
                                                                                                        = 18%
Percentage of students who played with no rollers skates = (30 + 18)%
                                                                                                  = 48%
                                   Laser tag                 No laser tag                Total
Roller skate                     25%                           27%                      52%
No Roller skate               30%                           18%                       48%
Total                                55%                           45%                      100%