Which of these are expressions?
Check all that are true.
x + y = z
3 + 9
9
x + 3 = 9
x + y
Answers
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