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avatar+439 

Consider the system of equations

 

15x-2y=16

15x-7y=51


Multiply the first equation by some constant, so that in the resulting equation, the coefficient of x matches the coefficient of x in the second equation.

Enter the entire equation that results from multiplying the first equation by the constant.

 

I dont understand what the question says or how to solve it.
 

 Sep 30, 2021
 #1
avatar+114880 
+1
 Sep 30, 2021
 #2
avatar+439 
+2

I did but this part:

Multiply the first equation by some constant, so that in the resulting equation, the coefficient of x matches the coefficient of x in the second equation.

Enter the entire equation that results from multiplying the first equation by the constant.

 

 

I get when it asks to multiply the first question by constant but after that its just a blur in my head.

 Sep 30, 2021
 #3
avatar+114880 
0

They both have 15x on the left side

 

If you TAKE the second left side of the first left side you will get rid of the x'es

The whole aim is to get rid of one of the letters.   Sometimes you add and sometimes you minus.

 

15x-2y=16

15x-7y=51

 

15x-15x   -2y- -7y = 16-51

       0       -2y + 7y = -35

                     5y     =  -35

                      y      =   7

 

now substitute to get x

Melody  Oct 1, 2021

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