Answers

1. Answer: Our answer set is( -1,-2 )

   Step-by-step explanation:

   y = x – 1

   y = 3x + 1

   We can use the combine method here.

   ==> – 1y + 1x = 1  (y = x – 1)

   ==>  -1y +3x = -1 (y = 3x + 1)

   – 1y + 1x = 1  

    -1y +3x = -1

   To single out any of the two variables, we need them to cancel out. Let us choose to cancel out y. We therefore multiply by negative 1 in the first re-arranged equation.

   ==> -1* (- 1y + 1x )= (1 ) * -1

   Now we add the equations

   ==> 1y -1x = -1

   ==>-1y +3x = -1

   ______________

   2x = -2

   Divide.

   ==> x = -1

   Now we insert x into any of the two original equations;

   y = (-1) – 1

   ==> y = -2

   Our answer set is( -1,-2 )

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