Question

Which of the following best describes the equation below?

y = -7x + 3
neither a relation nor a function
both a relation and a function
relation only
function only

Answer 1

ummm I'm not sure... sorry :/

Answer 2

@mathmate @Compassionate @campbell_st @e.mccormick

Answer 3

I not sure either

Answer 4

@iGreen

Answer 5

A relation is a set of points..a function is when there is a unique x-value for each value of y.

Answer 6

ok thx

Answer 7

@horsegirl325 What's your question?

Answer 8

Some more info:
http://www.regentsprep.org/regents/math/algtrig/atp5/lfunction.htm

As you can see, functions are relations but not all relations are functions.

Answer 9

After reading carefully e.mccormick's link, you can appreciate the following useful and easy to remember facts:
1. Some relations are functions, some are not.
2. All functions are relations.
3. All polynomials of one variable are functions (very handy to know).
4. Polynomials of one variable include constant functions such as y=5, linear functions such as y=2x-1, quadratic functions such as y=x^2+2x-1,.... and polynomials of higher degrees.