Question

Which of the equations below could be the equation of this parabola?

http://media.apexlearning.com/Images/201011/24/d0ca85d2-2717-4c12-adc4-e439d8732780.gif

A. y = -3x2
B. y = 3x2
C. x = -3y2
D. x = 3y2

Answer 1

If the parabola is turned sideways, would it be because it's y = or would it be because it's x =

Answer 2

X ?

Answer 3

Correct, so that eliminates two of the answers. Now we just need to find out if it's negative or positive.

Answer 4

Let's think about original parabolas first.

X^2 would be positive and -X^2 would be negative right? It's positive because we are looking for Y= and when the Y is positive, it's above the X axis, making the parabola above the X axis also.

When it's negative, that makes the parabola under the X-axis, which is the negative values

Same things for x = parabolas

Which do you think it is? Why would it be?

Answer 5

so its negative making it y=-3x^2?????

Answer 6

Correct, because -x values are on the left side of the graph, and positive x's are on the right side. Good job

Answer 7

thank you very much

Answer 8

Anytime!

Answer 9

u got the answer right

Answer 10

No, it was the right way but insted of y=-3x^2 the y in this equation is no what needs to be looked at its the place where x is the coefficient ,
making it C. x = -3y2

Answer 11

he was right about the way they face tho to be negative positive and stuff tho

Answer 12

Aw damn, I didn't see that. I saw we said it was x= the first time, but I didn't realize the y= switch, mb. I still thought you were with x=

Answer 13

its fine you still helped me a BUNCH with that question so thank you