Question

GIVING A MEDAL PLEASE HELP!

Answer 1

To tell that a relationship is whether a function or not, it is better you draw graphs. Graphical representation is the best way.

Answer 2

\[2x^{2}+y ^{2} - 1 \] is a circle. Acircle looks like this

Answer 3

Each input has two outputs. So it isn't a function

Answer 4

i think its b and c

Answer 5

This is how the next one looks
Each input has only one output. So, it is a function

Answer 6

This is how x=3y^2 looks

Answer 7

Each input has two outputs. So it is not a function

Answer 8

y = 2x +1 is obviously a function because it is a straight line

So, the answers are b and d.