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November 17th, 2006, 03:13 PM   #1
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HALF RIGHTT

Solve the system of equations by graphing:
y = 5x - 7 and y - 5x = 8

ok for this my answer came out to be half right...help please this is what i did:

y - 5(0) = 8
y - 0 = 8
y = 8
points> (0,8 )
7 - 5(1) = 8
y - 5 = 8
add 5
y = 13
points> (1,3)

y = 5(0) - 7
7 = -7
points>(0,-7)
y = 5(1) - 7
y = 5 - 7
y = -2
points>(1,-2)
now what why did i get half right?
and then i graphed teh points
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November 25th, 2006, 05:57 AM   #2
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y = 5x - 7 and y - 5x = 8

these two equations has no solutions. if you graph them, you'll see that they are parallel lines and don't intersect at any point. and so the equations you mentions don't have any solutions.

the first equation is
y = 5x - 7
y - 5x = -7...................(1)

the second equation is
y - 5x = 8....................(2)

comparing (1) and (2), we get, -7 = 8 which is absurd. thats why. the equations don;t have any solutions.
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November 27th, 2006, 08:12 AM   #3
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thanks took too long i already had the asnwer already gave it in but thanks
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December 5th, 2006, 04:23 AM   #4
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In general, in graphing exercises, if you get weird results and everything else looks fine, you are probably facing parallel lines, degenerate conics, or something like that.
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