Can someone translate what this means in geometry?

"p if, and only if, q" aka it is biconditional because "p only if q" and etc :)

Hope this helps, have a nice day :D

Planes P and Q only intersect along line r. Postulate 2.7, which states that if two planes intersect, then their intersection is a line.

Step-by-step explanation:

Planes P and Q only intersect along line r. Postulate 2.7, which states that if two planes intersect, then their intersection is a line.