Which BEST DESCRIBES 3y + 2x + 18?
A)
3y + 2x + 18 is an equation because values can be substituted for x and y.
B)
3y + 2x + 18 is not an expression because both x and y are variables,
C)
3y + 2x + 18 is an expression because it cannot be solved
D)
3y + 2x + 18 is an equation because there are 3 terms