Question

Parabola question pic in comments

Answer 1

First, is the axis of the parabola x-axis or y-axis?

Answer 2

y

Answer 3

Correct!
So, the equation of this parabola has to look like y=ax^2, right?
(Since if the axis of the parabola is x-axis, then it would be x=ay^2)

Answer 4

i really dont know my teacher didnt teach me this lol...just told me to take the test

Answer 5

oh. Then just know this:

Answer 6

Since the graph in the problem is the left one, it should be y=ax^2.
So, we can eliminate choice 1 and choice 4.

Answer 7

yeah i figured since its on the y

Answer 8

Now, is the graph point up or down?

Answer 9

If the graph is pointing up, then the equation is y=ax^2 where a is POSITIVE

If the graph is pointing down, then the equation is y=ax^2 where a is NEGATIVE

Answer 10

up?

Answer 11

no ..down?

Answer 12

if the graph is increasing, then the graph points up

if the graph is decreasing, then the graph points down

Answer 13

down

Answer 14

sorry. let me make this a bit clearer.
i used the wrong word.
let's start over after we eliminated choice 1 and 4

Answer 15

If the parabola OPENs upward, then the equation is y=ax^2 where a is POSITIVE
If the parabola OPENs downward, then the equation is y=ax^2 where a is NEGATIVE.