Question 766099
x= Number of $10 notes 
y= Number of $5 notes 

1 x + 1 y = 34 .............1 
Total value 
10 x + 5 y = 285 .............2 
Eliminate y 
multiply (1)by -5 
Multiply (2) by 1 
-5 x -5 y = -170 
10 x + 5 y = 285 
Add the two equations 
5 x = 115 
/ 5 
x = 23 
plug value of x in (1) 
1 x + 1 y = 34 
23 + y = 34 
y = 34-23 
y = 11 
y = 11 
x= 23 Number of $10 notes 
y= 11 Number of $5 notes