The speed of sound through air varies with the temperature (in Celsius)
of the air as v =3C/5+330, where v represents speed expressed in meters/second. What is the y-intercept of this function?

A) -110

B) 0.6

C) 330

D) 550

E) -550

Question

The speed of sound through air varies with the temperature (in Celsius) 
of the air as v =3C/5+330, where v represents speed expressed in meters/second. What is the y-intercept of this function?

A) -110

B) 0.6

C) 330

D) 550

E) -550

megankeeping · Answer

I assume you would plot the graph with v on the y-axis and C on the x-axis.
This means you can substitute C as 0 to find what v would be when the line meets the y-axis.

megankeeping · Answer

v=(3x0)/5+330

anonymous · Answer

so I just solve this equation and i'll have my answer?

megankeeping · Answer

The y-intercept is where a line meets the y-axis (when x = 0) so if you are plotting a graph with C as x and v as y, the y-intercept will be the value of v when C=0

megankeeping · Answer

If you have an equation in the y=mx+c format where m is the gradient, c is the y-intercept
The equation you have is in this format just with v and C instead...
$$v=\frac{ 3 }{ 5 }C+330$$