Which of these are expressions?
Check all that are true.

x + y = z

3 + 9

9

x

1 thought on “Which of these are expressions?<br /> Check all that are true.<br /><br /> x + y = z<br /><br /> 3 + 9<br /><br /> 9<br /><br /> x”

1. Answer:The word variable means something that can vary i.e., change and
   

   constant means that does not vary. The value of a variable is not
   

   fixed. Variables are denoted usually by letters of the English alphabets
   

   such as x, y, z, l, m, n, p, a etc

   Step-by-step explanation:

   The word variable means something that can vary i.e., change and

   constant means that does not vary. The value of a variable is not

   fixed. Variables are denoted usually by letters of the English alphabets

   such as x, y, z, l, m, n, p, a etc.

   • The expressions are formed by performing operations like addition,

   subtraction, multiplication and division on the variables and

   constants.

   • An equation is a condition on a variable (or variables) such that two

   expressions in the variable (variables) have equal value.

   • The value of the variable for which the equation is satisfied is called

   the solution or root of the equation.

   • An equation remains the same if the LHS and the RHS are

   interchanged.

   • In case of balanced equation if we (i) add the same number to both

   the sides, or (ii) subtract the same number from both the sides, or

   (iii) multiply both sides by the same non-zero number or (iv) divide

   both sides by the same non-zero number, the balance remains

   undisturbed.

   • Transposing means moving from one side to the other. When a term

   is transposed from one side of the equation to the other side, its sign

   gets changed.

   • Transposition of an expression can be carried out in the same way

   as the transposition of a term

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