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how do you use substitution for y=4 3x-y=1

Guest Mar 14, 2017
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y=4     3x-y=1        just sub for y in the second equation

 

3x - 4 = 1      add 4 to both sides

 

3x  = 5         divide both sides by 3

 

x =  5/3

 

 

cool cool cool

CPhill  Mar 14, 2017

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