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
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14s-91t = 840 (1st eqn x 7)
---------------- Add
-182t = 0
t = 0
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2s - 13*0 = 120
s = 60
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
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2s=120
s=60
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-14*60=-840
-840=-840
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 ,
(