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What is y=4x+5 and -12x + 3y=5 ?

 Feb 27, 2020
 #1
avatar+22043 
+2

-12x + 3y=5       y=4x+5    put in this value for 'y'

-12x + 3(4x+5)  = 5

-12x + 12x + 15 = 5      error !  

                      15 = 5     ERROR!   Did you post your question correctly ????    cheeky

 Feb 27, 2020
 #2
avatar+109499 
+1

y = 4x +  5  rearrange  as

 

-4x  + y  = 5    (1)

 

Note  that if we divide  the second equation  by  3     we  get that

 

-4x  + y  =  5/3       (2)

 

But notice  that   - 4x + y    couldn't  be  equal to   two different  values  ( 5  and 5/3)

 

So.....as EP found....we have no solutions   !!!!

 

cool cool cool

 Feb 27, 2020

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