Question

help
How can x2 = x2 + 2x + 9 be set up as a system of equations?

A) y = x2 − 9
y = x2 + 2x + 9
B) y = x2
y = x2 + 2x + 9
C) y = x2 + 2x
y = x2 + 9
D) y = x2
y = 2x + 9

Answer 1

@zepdrix

Answer 2

x2 means x^2

Answer 3

Any ideas?

Answer 4

no not at all

Answer 5

I was thinking option B but I'm not sure

Answer 6

The way you can check, is by setting each equation in the system equal to each other and see if you get the above equation

Example: The first one

y = x2 − 9
y = x2 + 2x + 9

Set them equal

x^2-9=x^2+2x+9


This is not what we started with, so it is not the answer.

Answer 7

You are right, but now do you understand why?

Answer 8

yes I do :)

Answer 9

so letter B is the correct answer

Answer 10

yep

Answer 11

if you set them equal, you get the thing you started with.