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by lordofthefishes
Sun Oct 20, 2013 3:54 pm
Forum: Intermediate Algebra
Topic: Function Correspondence: (1, 8) is on the graph of y = f(x)
Replies: 3
Views: 3490

Re: Function Correspondence: (1, 8) is on the graph of y = f

Thank you, but I'm still a little confused. Why "do I have to do -1 so -x = -(-1) = +1 = 1"? Shouldn't the x correspondence of y = f(x) be (1)/-1 = -1 according to the correspondence equation?
by lordofthefishes
Sat Oct 19, 2013 3:47 pm
Forum: Intermediate Algebra
Topic: Function Correspondence: (1, 8) is on the graph of y = f(x)
Replies: 3
Views: 3490

Function Correspondence: (1, 8) is on the graph of y = f(x)

"The point (1,8) is on the graph y=f(x). Find the corresponding coordinates of this point on each of the following graphs: ... c) y= -2f(-x)-7." The textbook answer is (-1,9). I don't understand how they got this answer. The only way that that would make sense is if the corresponding y coo...
by lordofthefishes
Mon Sep 02, 2013 11:08 pm
Forum: Beginning Algebra
Topic: What's the difference between these two equations?
Replies: 2
Views: 1712

What's the difference between these two equations?

My textbook asks me to graph out two equations: x^2+y^2=25 and y=sqrt(-x^2+25) I think that algebraically these are identical. In the solutions, the text shows two different graphs. The text says that the first equation fails the vertical line test, because its graph is essentially a circle. However...

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