The solution to the system of equations is (-2,-2).
You can solve systems of equations by substitution, eliminations, or graphing.
x - 4y = 6
x = 6 + 4y
3x + y = -8
3(6 + 4y) = -8
18 + 12y = -8
12y = -24
y = -2
x = 6 + 4y
x = 6 + 4(-2)
x = 6 - 8
x = -2
Your final answer is C. (-2,-2).