Answer:
x=−5 and y=1
Step-by-step explanation:
 
        
             
        
        
        
In order to find the solution you just have to answer one of the equations to solve for x then plug it in for the other ones. so lets start. so x equals 1/3
        
             
        
        
        
Answer:
a. 720 
b. 0.3
Step-by-step explanation:
a. 
Three balls are selected at random without replacement.
First ball can be selected in 10 ways
Second ball can be selected in 9 ways
Third ball can be selected in 8 ways
Thus, there are 10×9×8 =720 different ways of selecting three balls. 
b.
There are three cases that satisfy this condition
- first ball picked is 5, the others are not
- first ball is not 5, second is 5, third is not
- first and second ball is not five, third ball is 5
Each probabilities are:
 
 
 
Thus, one of the balls selected is the number 5 is then 
 
        
             
        
        
        
Answer:
3/6 or 1/2.........................