What does it mean when two lines intersect?

It means they cross each other in a plane and have a point of intersection which is where the two lines meet and share a point.

a) 0.25x times 3. (could be wrong on equation.)

b) 2.25 pound of dark chocolate. (can i eat all the chocolate? plz? anyway, again, could be wrong, but i hope im right. all the chocolate together should be 5.25 pounds)

have a good day!