Solve using substitution method

Question

X-2y=-1

y=-2x+8

Answer 1

     X - 2Y = -1

 

     Y =-2X + 8

 

substitute for Y in the first equation

 

 X - 2 (-2X + 8) = -1

 

      X + 4X - 16 = -1

 

            5X - 16 = -1

 

                    5X = 15 

 

                     X = 3

 

                    Y = 2