Question

Determine whether the formula describes y as a function of x. Explain your reasoning.

y = -x

Answer 1

First, look at the formula, it has y on one side and then it shows you what to do to x on the other side (in this case make it negative). Then, what can you conclude?

Answer 2

x is always the opposite of y???

Answer 3

No not exactly, what math are in you in, that will make it easier to explain

Answer 4

pre-cal

Answer 5

Yes. A function is defined as having only one y value for each x value. Have you heard of the vertical line test? This equation will pass the vertical line test. No matter what x values we put in, we will never get repeated y values.
Also, if you have no idea what I am talking about, think about this: This equation will make a straight line. Every straight line is a function (unless it goes straight up and down).

Answer 6

Yes, in the case of functions

Answer 7

oh,i get it,and thnku @No.name and @doulikepiecauseidont i will give u both medals!

Answer 8

You can't give two medals.

Answer 9

oh,wait,sorry:(i can only give one of u a medal

Answer 10

Sometimes you might encounter graphs of things where it's easier to keep both x and y on the same side, such as the equations of a circle but it isn't a function a vertical line touches the graph more than once

Answer 11

If a graph is a function, then you will be able to draw a vertical line anywhere on the graph and it will only touch the graph ONCE on the line

Answer 12

ok.thankyou soooooooooooo much @doulikepiecauseidont.I am fan of u!

Answer 13

Anytime