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posted by  jessicastettler on 11/3/2009 2:23:37 PM  |  status: Closed  |  Earned Karma: 51

simple math

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N/A N/A N/A N/A 11/4/2009 at 11:00:00 AM
Question Details:
Sarah tried to solve the equation -4x + y = 20 by adding 4 to both sides. He wrote 4 – 4x + y = 4 + 20 which then changed to 0x + y = 24 and finally y = 24. How would you help Sarah?

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Scholar
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posted by tyl2ant on 11/3/2009 2:31:58 PM  |  status: Live
Clarification Details:
I'm guessing you already know that it is wrong because 4-4x does not equal 0x. 

I'm also assuming that you're supposed to be finding the y = mx + b expression?
So...
-4x + y = 20
y = 4x + 20
y-int:
y = 4(0) + 20
y = 20
x-int:
0 = 4x + 20
-4x = 20
x = -5

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posted by steph renee on 11/3/2009 8:10:04 PM  |  status: Live
Asker's Rating: Lifesaver   
Response Details:
-4x+y=20
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