Question 243032: solve using any appropriate method. Full work out please.
2.1x - 0.9y =15
-1.4x + 0.6y=10 Found 2 solutions by nyc_function, oberobic:Answer by nyc_function(2741) (Show Source):
You can put this solution on YOUR website! I can send a reply to your math question using paint attachment, which is far easier to read and follow.
Write to: nycfunction@yahoo.com
Guido
P.S. Post one question at a time for a faster reply.
You can put this solution on YOUR website! First, multiply everything by 10 to get rid of the decimals.
EQ. 1: 21x - 9y = 150
EQ. 2: -14x + 6y = 100
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Divide EQ. 1 by 3: 7x - 3y = 50
Divide EQ. 2 by 2: -7x + 3y = 50
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This is a disturbing pair of equations because they are just too similar.
Consider -7x + 3y = 50 can be written as -(7x - 3y) = 50.
Given 50 = 50 (a tautology), we now can say:
7x - 3y = -(7x - 3y), which seems a contradiction in terms.
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Perhaps they're parallel, in which case there is no solution.
We can test this theory putting them in slope intercept form.
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EQ 1.
7x - 3y = 50
-3y = -7x + 50
which is simply...
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EQ 2.
-7x + 3y = 50
3y = 7x + 50
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So we have parallel lines, so there is no solution to the system of equations.
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