SOLUTION: how do i solve these two problams using the elimination method ?
1. 10x+6y =0
-7x+2y =31
for this one i got (9.3, -15.5) but i have a feeling that is wrong
and 2.
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Question 225185: how do i solve these two problams using the elimination method ?
1. 10x+6y =0
-7x+2y =31
for this one i got (9.3, -15.5) but i have a feeling that is wrong
and 2. 3x+4y=-13
5x+6y=-19
for this one i got (-25, 15.5) but again , because the answers i gto are so big and decimals, i think im doing the problems wrong
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
# 1
Start with the given system of equations:
Multiply the both sides of the second equation by -3.
Distribute and multiply.
So we have the new system of equations:
Now 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 .
Reduce.
------------------------------------------------------------------
Now go back to the first equation.
Plug in .
Multiply.
Add to both sides.
Combine like terms on the right side.
Divide both sides by to isolate .
Reduce.
So the solutions are and .
Which form the ordered pair )
.
This means that the system is consistent and independent.
Notice when we graph the equations, we see that they intersect at . So this visually verifies our answer.
Graph of (red) and (green)
# 2
Start with the given system of equations:
Multiply the both sides of the first equation by 3.
Distribute and multiply.
Multiply the both sides of the second equation by -2.
Distribute and multiply.
So we have the new system of equations:
Now 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 .
Reduce.
------------------------------------------------------------------
Now go back to the first equation.
Plug in .
Multiply.
Subtract from both sides.
Combine like terms on the right side.
Divide both sides by to isolate .
Reduce.
So the solutions are and .
Which form the ordered pair )
.
This means that the system is consistent and independent.
Notice when we graph the equations, we see that they intersect at . So this visually verifies our answer.
Graph of (red) and (green)
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