#1**+2 **

y = 2x - 8 rearrange as 2x - y = 8

2x - y = 8

Note that these equations are* exactly* the same.....anytime we have that, NSS, we will have infinite solutions....!!! [dependent ]

-2x - y = 1 multiply through by 2 → -4x - 2y = 2

-4x - 2y = -1

Note, NSS.......when one equation equals one thing and the * same* equation equals something else, we will have no solutions.......

Think about this......if I add or subtract two quantities....I get some result

So.....if I add or subtract the same two quantites....it will be impossible to get something different from the first result.....!!!!

CPhill
Oct 10, 2017