Math
posted by Milia .
How would you tell if an equation is a funtion or not. I know that it has to have only one yvalue for every x...but how do you identify this in an equation (rather than a graph)
ie. y=1/2x7 (how do i tell if this is a funtion or not)?
Any help would be much appreciated :)

when dealing with linear functions, the general formula is y= mx + c..where m is the gradient and c is the yintercept. To find the value of x simply make y = to zero.hence the equation(y=1/27) is a linear function because if substituted in the general formula,1/2 would be the gradient(since it is the value/coefficient of x),, c=7 and x=1.

Please use parentheses where needed for clarity. I don't know if that is
1/(2x7) or (x/2) 7 or (1/2x) 7
In each case, y is clearly a function of x because there is one and only one y for each x. (Except possibly where a denominator vanishes) 
thanks :)
Respond to this Question
Similar Questions

Maths Important
How would you draw the graph of this x^2/16 + y^2 = 1 ( this is an ellipse if I'm not mistaken) I'm confused since y^2 has no value beneath it. so what would the coordinates be for this. the same problem with this one x^2/16  y^2 … 
math check again please
I have a slope of 3/4 and the yintercept at 8 the equation looks like: y= 3/4x + 8 can someone tell me if i'm correct when i'm graphing it. the two points that cross in the x axis and y are (0,8) and (10.5,0) am i correct? 
math
How do I know that x^27=y is a function? 
Algebra 2
I am creating a project for math in which I have to draw an object using: parabolas, hyperbolas, circles,etc. We use conic section equations to identify where they are on the graph. I have confusion about writing the equation of parabolas. … 
Math(check)
1)Find the range of the relation [(1,4)},(2,5),(3,5)}.Then determine whether the relation is a funtion. 4,5,5 is the range 4,5 is a function 2)Find f(1),if f(x)= x^26x/x+2 (1)^26(1)/1+2 1+6/1+2 7/1 =7 3)Find f(a),if f(t)= 2t^2t2. … 
math
identify the value of m in each equation. Then match each equation with it's graph. 
Algebra
Here's the question I'm having trouble with: Tell how you would identify the intercepts for the graph of the equation: 3x + 6y = 18 I'm not exactly sure how you would find the intercepts from this equation. Thanks! 
Algebra
How can you tell an equation's real or imaginary roots just from its graph, without knowing the equation? 
math
y = 2.5 ยท4^x as the equation for the blue line shown in the graph, rather than the equation given in your text. Note that your line will now be tangent to the graph at the point ( 0, 2.5 ). Enter the value of c here 
trig
1. A Ferris wheel with a radius of 7m makes one complete revolution every 16 s. The bottom of the wheel is 1.5m above ground. a)Find the equation of the graph b)predict how the graph and the equation will change if the Ferris wheel …