Astronomy Algebra Crossword Puzzle

Pluto once said that a_________ is a symbol, commonly know as a alphabetic character.
Jupiter said to Saturn that 3x is an example of a __________.
Neptune describes 5 as a ___________ which is a number on it's own.
Saturn knows that __________ means to make an equation simpler.
Venus describes the _________ as the number times a variable.
The stars say that 6y + 2y is an example of a ____________.
Earth told Uranus that a __________ is an expression with multiple variables and coefficients.
Before the rocket launched the astronaut stated that __________ is a 3-term expression.
The moon told The Sun that 2y - 4x is an example of a__________.
The captain said that a __________ is a 2-term expression.
Uranus said that in the equation 4 x y + x y has a _______ of 7.
Mercury said that 4 is a__________.
All the planets have agreed that the __________ is the number above the fraction line.
Pluto said that 4y , 2y ,7xy ,5 are all examples of _________.
Earth said that an _________ tells how many times a value is going to be multiplied by itself.
Neptune knows that the ___________ is the bottom half of a fraction.
Saturn said that __________ means taking away the parentheses in a equation.