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Which ordered pair is the solution to the system of equations?

{−5x−3y=12y=x−12

 

(3, −9)

(0, −4)

(−6, 6)

(1, −11)

 

would the answer be (3,-9)?

hoiuu  Oct 30, 2018
edited by Guest  Oct 30, 2018
 #1
avatar+13578 
+1

Is this Q written correctly?

-5x - 3y = 12y

-5x = 15y

x = -3y         NONE of the options fit this equation.

ElectricPavlov  Oct 30, 2018
 #2
avatar+91027 
+2

I think this is supposed to be

 

-5x - 3y  =  12

y = x - 12

 

Sub the second equation into the first for y and we have

 

-5x - 3 ( x - 12)  = 12  simplify

 

-5x  - 3x + 36  = 12     

 

-8x + 36  = 12    subtract  36 from both sides

 

-8x  =  - 24    divide both sides by -8

 

x  = 3

 

And    y  =    3 -  12  =  -9

 

So you are correct!!!!....    (3 , -9)  is the solution

 

 

cool cool cool

CPhill  Oct 30, 2018
edited by CPhill  Oct 30, 2018
 #3
avatar+13578 
+1

Ahaaaaa!   It is all clear to me now !   Haha        cheeky

ElectricPavlov  Oct 30, 2018

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