How to write an equation of a horizontal line through a point?

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

(08.01)consider the following pair of equations: x + y = −2 y = 2x + 10 if the two equations are graphed, at what point do the lines representing the two equations intersect? (−4, 2) (4, 2) (−2, 4) (2, 4)

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents