Determine the truth value

1a) \exists yx=y \rightarrow x > y))" alt="\forall x\exists yx=y \rightarrow x > y))" />

1b) \forall yx=y \rightarrow x > y))" alt="\exists x\forall yx=y \rightarrow x > y))" />

Logical equivalents?

2a) and

2b) and

2c) and

2d) and

Please and thanks,

James