What are some expressions that equal 2v2

6.3x+14 and 1.5x-6 answer in simplified form

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

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.