how to determine whether y varies directly with x? and if it does how would i find the constant of variation k and write the equation

Question

anonymous · Answer

equations that are similar to the linear function y=mx + b.  

y = kx

k = y/x.   K is the slope of the linear function i think.

anonymous · Answer

but how do i figure out if y varies directly with x

anonymous · Answer

well, if u have an equation that is similar to the linear function, y = mx + b, then you know that the shape of that equation is linear meaning that y has a direct relationship with x. In other words, you know that y varies with x.

anonymous · Answer

for example, newton's second law , Fnet = ma. 

As you can see, its y varies directly with x.