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well a function is a relation between numbers where every x value has only one corresponding y value. for ex: if i have a set of numbers (2,1) (2,0) this isn't a function because for the x value of 2 i have 2 different y values of 1 and 0. so for this question you can start by making a table of values to see if it's a function or not. ex: X | Y ------ 1| -1 | |
plug in and solve like x=2 y=-2
oh i'm sorry i was just trying to a explain what a function was with an example. at the end i was saying that you could make a chart/table to see if it was a function or not. like up there i said if x is 1, then y is -1. because y= -x so y= -(1) , y =-1 and if x was 2, y would be... etc. if the function thing or the definition is confusing, it's basically like: (the photo) kinda lame but that's how i take notes
yes it's a function. well why do you think it is?
so in the photo each x value has a certain y value. but when x is 5 y is 7. and then when x is 5 y is also 8. so its not a function because for the same x value you have 2 different y values
oh really? yay! that's great! glad it made sense! :D