- #1

Jaco Viljoen

- 160

- 9

## Homework Statement

Which of the following represent a function:

a)[tex]y=-1/2x+3[/tex]

b)[tex]x^2+y^2=25[/tex]

c)[tex]y=2x^2+7x+3[/tex]

## Homework Equations

## The Attempt at a Solution

a)

b) is a circle so has 2 values for y and is not a function.

c)

I know that functions only have 1 y relation to x but don't know how to prove whether a and c are functions or not.

Thank you

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