SOLUTION: using "solve by elimination" what is the answer to, 7x+2y=10 and negitave 7x+1y= negitave 17
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Question 554702
:
using "solve by elimination" what is the answer to, 7x+2y=10 and negitave 7x+1y= negitave 17
Answer by
jim_thompson5910(35256)
(
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):
You can
put this solution on YOUR website!
Start with the given system of equations:
Add the equations together. You can do this by simply adding the two left sides and the two right sides separately like this:
Group like terms.
Combine like terms.
Simplify.
Divide both sides by
to isolate
.
------------------------------------------------------------------
Now go back to the first equation.
Plug in
.
Multiply.
Multiply both sides by the LCD
to clear any fractions.
Distribute and multiply.
Add
to both sides.
Combine like terms on the right side.
Divide both sides by
to isolate
.
So the solutions are
and
.
Which form the ordered pair
.
This means that the system is consistent and independent.
If you need more help, email me at
jim_thompson5910@hotmail.com
Also, please consider visiting my website:
http://www.freewebs.com/jimthompson5910/home.html
and making a donation. Thank you
Jim