Which function has the greatest y-intercept?

Question

anonymous · Answer

attachment

anonymous · Answer

f(x)
 g(x)
 h(x)
 All three functions have the same y-intercept.

vocaloid · Answer

Question is unclear, what are f(x), g(x) and h(x) referring to?

anonymous · Answer

My bad, only one of the graphs posted

anonymous · Answer

f(x)= -3x − 5

anonymous · Answer

g(x)=the imagine I posted

anonymous · Answer

h(x) = 2 cos(2x − π) + 4

@Vocaloid

vocaloid · Answer

In each equation, substitute 0 for x. Whichever one gives you the greatest result will give you the greatest y-intercept. (Remember that the y-intercept occurs when x = 0)

anonymous · Answer

So would f(x) be -5?

vocaloid · Answer

Yes. (0,-5) is the y intercept for f(x).

anonymous · Answer

Okay great. The only thing is that I dont know how to simplify h(x) = 2 cos(2x − π) + 4...they taught us in the lesson but I didnt understand at all. Can you help me?

vocaloid · Answer

Sure, do you understand the unit circle? Substitute 0 for x, which gives you 2cos(− π) + 4. cos(-π) is equivalent to cos(π) because (-π+ 2 π = π). To find 2cos(π), use the unit circle. |dw:1432319207041:dw|