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Expressions
Mathematical phrases that contain numbers, variables, and/or operations. Equations relate these that are equal to each other
Inequalities
These relate expressions that are not equal using comparision symbols, such as greater than or less than
Expressions
What are these: 9-2y, -x, and 3(x-12)
Equations
What are these: 9-2y=27, x=8, and -3(x-12)=2(3x+15)
Inequalities
What are these: 9-2y<27x, x>8, and -3(x-12)≥2(3x+15)
Erroneous
In a word problem: identify the extraneous or this(incorrect) information, pick a variable and tell what it represents. This is called defining a variable