3x-4y=-2 -3x+y=-13 solve by substitution

Question

do i add or take away best way to set up thank you

Answer 1

3X - 4y = -2

 

-3X + Y = -13

 

 

Y from the 2nd equation:

 

  Y = 3X -13

  SUBSTITUTE back into first equation:

 

   -3X - 4 ( 3X - 13 ) = - 2

 

   3X - 12X + 52 = -2

  

     -9x = -54

 

 

    

      X = 54 = 6

             9

 

  3 ( 6 ) -4Y = - 2

      

     Y = 20 = 5

            4