Is a negative decimal always, sometimes, or never equal to a positive decimal? explain.

Asap! i'm not good math and i'm lost.

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

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.