g(x) = 0.8(x) First things first. Lets make solve for g from our gx = 0.8x equation to do this, we must get rid of x by dividing both sides by x gx 0.8X ____ = ____ leaves us with g = 0.8 X X Another way to check this out is by substituting x with any number. Let`s use 1 as an example. Now, our equation reads: g(1) = 0.8(1) Answer is g = 0.8 Let`s double check the value of g by substituting x with 2 this time: Now our equation reads: g(2) = 0.8(2) 2g = 1.6 Now divide both sides by 2 so that g can be by itself 2g/2 = 1.6/2 Answer is still g = 0.8 Now lets replace g with 0.8 so that the equation reads: 0.8(x) = 0.8(x) I don`t know if you are missing any other information but this is how to solve for unknown factors (this case letter g) based on your equation g(x) = 0.8(x) Now if you are looking at g as gravity in a velocity kind of equation, then I would like more detail to the problem so I better help you. Good luck