Graph the system below and write its solution.
2x+y=-6
y= -1/3x-1

2x + y = -6
y = ⁻¹/₃x - 1

2x + (⁻¹/₃x - 1) = -6
     2x - ¹/₃x - 1 = -6
          1²/₃x - 1 = -6
                  + 1  + 1
               1²/₃x = -5
                1²/₃    1²/₃
                    x = -3

y = ⁻¹/₃x - 1
y = ⁻¹/₃(-3) - 1
y = 1 - 1
y = 0
(x, y)= (-3, 0)