How to find y=mx+b in the equation

You need a point or a slope to begin.

Step-by-step explanation: Once you have a point and the slope, then you can plug in to find the b value, then write your equation in y = mx + b form

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)