Question

When you solve an equation, how do you know when to add and when to subtract? You may include an example if you need to.

Answer 1

you do the opposite of what the equation says.... here is a really simple method called backtracking.... it steps you through the equation...

as an example

the equation

2x + 5 = 13

pick a letter x, then multiply it by 2 add 5 to it and the answer is 13

now do the reverse start with 13 subtract 5 and then divide by 2

graphically it looks like