Is the equation an example of growth or decay?
y = 4x

Question

Is the equation an example of growth or decay? 
y = 4x

hero · Answer

Looks like growth to me. You have x and it increases directly as y increases.  

If it was y = 1/4x then x would decrease as y increases

anonymous · Answer

another way you can think of this is by asking your self:

Is x positive?

Is the base greater than 1?

shayaan_mustafa · Answer

Hi MichaelaRose :)

Do you know how to play with increasing and decreasing function . If so then it is easy to realize it for you..

anonymous · Answer

My notes say that if b is greater than 1, it's growth and if it's between 0 and 1, it's decay. I just don't understand because there is no b.

shayaan_mustafa · Answer

I think here b means y-intercept.
because the equation you showed in your question is the equation of the straight line.
y=4x+0
and standard equation of straight line is given as 
y=mx+b
where
m= slope; in your case it is 4
b= y-intercept; in your case it is 0

Have you got it?