2006-09-25 09:23:22 · 5 answers · asked by big_j_gizzy 4 in Science & Mathematics ➔ Mathematics
I have no equation to look at...I am suppose to differentiate the two by looking at only the graph...
2006-09-25 09:31:45 · update #1
Oh, ok...thanks Lufen, it's all coming back to me now. :-P
2006-09-25 09:32:31 · update #2
A function of X passes the vertical line test; a function of Y passes the horizontal line test. If a function passes a horizontal/vertical line test, you can draw a horizontal/vertical line anywhere on the graph and it will only intersect with the function no more than once.
2006-09-25 09:31:18 · answer #1 · answered by lufen 3 · 0⤊ 0⤋
you cannot really tell from a graph... cause i could have a straight line graph with slope 1, and y intercept 0... for which i could say y = x (a function of x)... or x = y (a function of y)... in school, more often than not, it is a function of x (e.g. y = x^2 + 7x + 3 is a function of x; whereas x = 0.25y is a function of y)
2006-09-25 16:28:20 · answer #2 · answered by JonnyG 2 · 0⤊ 0⤋
If for each x there's only one y, then y is a function of x and If for each y there's only one x, then x is a function of y. If both conditions are satisfied, then you have a bijection, y = f(x) and x = f^(-1)(y) (the inverse of f).
If for some x (or y) you have more than one value of y (or x) then y is not a function of x ( or x is not a function of y)
2006-09-25 16:35:01 · answer #3 · answered by Steiner 7 · 0⤊ 0⤋
depending on which is the dependent variable and which is the independent variable
y^2=4ax-parabola y fn. of X
x^2=4ay parabola again butx fn. of y
2006-09-25 16:29:48 · answer #4 · answered by raj 7 · 1⤊ 0⤋
V.L.T
2006-09-25 17:01:08 · answer #5 · answered by عبد الله (ドラゴン) 5 · 0⤊ 0⤋