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hey there its kaylee today were going to talk about something that i love equations this is a really exciting part of algebra and something you will continue to use in math ready lets go to start lets review what we know about algebra so far we know that there are things called expressions an easy one would be 3 plus 4 we can evaluate expressions by order of operations so in this case all we have to do is add and we would get 7 and we know that expressions can have variables whats a variable again ya its a number that can vary a number that can change we represent this varying number as a symbol typically a lower case letter like x so we can have an expression with a variable that looks like 2 x plus 1 and if we want to evaluate this expression ya we need to know some given values for x so what if were told that x is equal to 2 we could evaluate this by using substitution we plug in the given value of 2 wherever we see x so we would get 2 times 2 plus 1 order of operations we m