SOLUTION: SOLVE EACH OF THE FOLLOWING PAIR OF SIMULTANEOUS EQUATIONS: 1. 2X+5Y=-7 AND X-Y=7 2. 2/15M - 7/30N = 1 5/6 AND M-N = 10

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: SOLVE EACH OF THE FOLLOWING PAIR OF SIMULTANEOUS EQUATIONS: 1. 2X+5Y=-7 AND X-Y=7 2. 2/15M - 7/30N = 1 5/6 AND M-N = 10      Log On


   

Question 1141308: SOLVE EACH OF THE FOLLOWING PAIR OF SIMULTANEOUS EQUATIONS:
1. 2X+5Y=-7 AND X-Y=7
2. 2/15M - 7/30N = 1 5/6 AND M-N = 10
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
2X+5Y=-7 AND X-Y=7
2x-2y= 14
--------------------------------- Subtract
==================
If you mean:
(2/15)m - (7/30)n = 1 5/6 = 11/6
Multiply by 30
4m - 7n = 55
m-n = 10 ---> m = n+10
Sub for m
4(n+10) - 7n = 55
etc