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KARST

United States
Joined: May 21, 2012
Posts: 1
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Solving Systems of Equations by Graphing

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i need step by step help on how to do this for example:

y=5/4x-2
y=5/4x-1

confused

[May 21, 2012 9:56:31 PM]

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pskinner

Joined: Apr 2, 2005
Posts: 797
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Re: Solving Systems of Equations by Graphing

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i need step by step help on how to do this for example:

y=5/4x-2
y=5/4x-1

confused

You probably mean

y=(5/4)x-2
y=(5/4)x-1

Setting y=y and replacing each y by the left and right sides:

(5/4)x-2=(5/4)x-1

Subtracting the term (5/4)x from both sides (add -(5/4)x to both sides), since (5/4)x-(5/4)x=0, you get:

-2=-1

This is impossible...which means that the two straight lines that these equations represent never meet. So, they must parallel. In fact, the lines each have the slope (5/4) and differ by having the y-intercepts -1 and -2.
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Principal Skinner

[May 24, 2012 8:05:35 PM]

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rockroy

United States
Joined: May 29, 2012
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Re: Solving Systems of Equations by Graphing

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Great to know this ...... this will surely help me in solving my issues.
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truck loads

[May 29, 2012 5:57:36 AM]

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