Section: Math

13) Find the sum of r and v in the system of equations below. 

20r+10v=100
20v=170-10r

1. ¹/₉
2. 9
3. 3.67
4. 12

20r+10v=100
20v=170-10r
A10r 10r+20v=170

20r+10v=100
+ 10r+20v=170
30r+30v=270
D30 r+v=9