# data[].attributes.headline
Constraint                                           A limitation on the possible values of variables in a model, often expressed by an equation or inequality or by specifying that the value must be an integer. For example, distance above the ground , in meters, might be constrained to be non-negative, expressed by d > 0.  

# data[].attributes.subject
Constraint                                           A limitation on the possible values of variables in a model, often expressed by an equation or inequality or by specifying that the value must be an integer. For example, distance above the ground , in meters, might be constrained to be non-negative, expressed by d > 0.  

# data[].attributes.body
A verbal expression is a mathematical statement that is expressed in words.

# data[].attributes.headline
Like Terms                                 Terms whose variables (such as x or y) with any exponents (such as the 2 in x^2) are the same. Examples: 7x and 2x are like terms because they are both "x"

# data[].attributes.subject
Like Terms                                 Terms whose variables (such as x or y) with any exponents (such as the 2 in x^2) are the same. Examples: 7x and 2x are like terms because they are both "x"

# data[].attributes.body
Equations that have the exact same solutions are equivalent equations.

# data[].attributes.headline
Expression                                        An expression or mathematical expression is a finite combination of symbols that does NOT contain an "=" sign. 

# data[].attributes.subject
Expression                                        An expression or mathematical expression is a finite combination of symbols that does NOT contain an "=" sign. 

# data[].attributes.body
an algebraic expression is an expression built up from integer constants, variables, and the algebraic operations. For example, 3x² − 2xy + c is an algebraic expression. Since taking the square root is the same as raising to the power, is also an algebraic expression.

# data[].attributes.body
an equation is a statement that shows the equality of two expressions, which are connected by the equals sign "=".

# data[].attributes.body
A symbol for a value we don't know yet. It is usually a letter like x or y.

Example: in x + 2 = 6, x is the variable.

A number that can change in an equation.