What expressions are equivalent to 4d+6+2d

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship