X = log (base b) y
The base of the log becomes the base of the exponent.
The x and y switch.
b^x = y
No you could have left it as the last but one line or write them separately as
11/18 + √85 / 18 , 11/18 - √85/18
The answer is A because you turn the fraction in a decimal then divide by 5
slope = - 
calculate the slope m using the gradient formula
m= (y₂ - y₁ ) / (x₂ - x₁ )
with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (- 3, 6)
m =
=
= - 