Answer:
c; infinite solutions
Explanation:
to solve this system of equations you can use elimination
you can divide all of the top by 2
you get
3x + y = 6
and then
-3x - y = -6
but then when you subtract them you get 0 = 0
this means it is infinite solutions
another way to tell that it is infinite solutions is by seeing if the equations are the same
-3x - y = -6 is just 3x + y = 6 but everything is multiplied by -1