You look like U

I must x.

Do you know y?

I have two points

though I feel like I can go on for ∞

Sometimes I smile;

others I frown.

I intercept once ‘n awhile.

My parent looks like me

Or should I say I look like ‘em.

People always tell me:

“You look like U.”

Whatever that means.

But I’m always happy

no matter what.

For the graph is my home

and Quadratic is my last name.