SOLUTION: HELP PLEASE. I have to know which is a quadratic equation. Why and why not. a)y=2x+5 b)y=2x^3+5y^2+3 c)y=2x^2 +5y+3 d)y=2x^3+5 Thank you so much for your help!

Question 751183: HELP PLEASE. I have to know which is a quadratic equation. Why and why not.
a)y=2x+5
b)y=2x^3+5y^2+3
c)y=2x^2 +5y+3
d)y=2x^3+5
Thank you so much for your help!
Answer by Edwin McCravy(20054) (Show Source): You can put this solution on YOUR website!
a)y=2x+5

That's a LINEAR equation, not a QUADRATIC equation because
the highest power of the variable x is the first power.  
That is, it has degree 1. A QUADRATIC equation must have 
degree 2 which means it must have 2 as its highest power of
the variable x.

b)y=2x�+5y�+3

That's a CUBIC equation, not a QUADRATIC equation because
the highest power of the variable x is the 3rd power.  
That is, it has degree 3. A QUADRATIC equation must have 
degree 2 which means it must have 2 as its highest power of
the variable x.

c)y=2x�+5y+3

That's a QUADRATIC equation, because the highest power of 
the variable x is the 2nd power.  It has degree 2.

d)y=2x�+5

That's another CUBIC equation, not a QUADRATIC equation
because the highest power of the variable x is the 3rd power.

Edwin

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