SOLUTION: 2s-13t=120 -14s-91t=-840 suppose to solve using any appropriate method.

Question 392680: 2s-13t=120
-14s-91t=-840
suppose to solve using any appropriate method.
Found 3 solutions by Alan3354, rfer, josmiceli:
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
2s-13t=120
-14s-91t=-840
--------------
14s-91t = 840 (1st eqn x 7)
---------------- Add
-182t = 0
t = 0
------------
2s - 13*0 = 120
s = 60

Answer by rfer(16322)   (Show Source): You can put this solution on YOUR website!
s=6.5t+60
-14s-91t=-840
-14*(6.5t+60)-91t=-840
-91t-840-91t=-840
-182t=0
t=0
------------------------
2s=120
s=60
------------------
-14*60=-840
-840=-840
Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
(1)
(2)
First, multiply both sides of (2) by to get:
(2)
I notice that divides each term, so, dividing each term,
(2)
This is the same as (1) except for the sign of , so I'll
add (1) and (2)
(1)
(2)

Now I plug this back into (1)
(1)
(1)
Subtract from both sides

the solution is ,
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