Question

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Answer 1

2nd power is a quadratic

Answer 2

@precal why second??
in my opinion it's the first equation.

Answer 3

I did not say that the answer was the second equation, I stated that a quadratic is the 2nd power

Answer 4

yes

Answer 5

aren't you interested in all of them?
y=-2x-9 is linear, why? because it is to the first power