Variables and Expressions

Q. Which of the following is an expression in one variable?

1. $2x+3y$
2. $x^2+2y$
3. $5$
4. $x^2+2x+3$

Q.

Which of the following cannot be used as variable:

1. y

2. x

3. z

4. 5

Q.

Cost of an apple is $₹x$ and cost of mango is $₹y$ find the cost of $10$ apples and $15$ mangoes.

Q.

Separate the constants and variables from ab, 10, -2x, -1by 3 and my xy by 2.

Q. What is the variable in the expression $5x+6$?

1. $x$
2. 6
3. 5
4. +

Q. Solve the tree diagram.

1. 3
2. 4
3. 6
4. 2

Q.

If a notebook costs Rs p and a pencil costs Rs 3, then the total cost (in Rs) of two note books and one pencil. Give expression.

Q. Which of the following constitute an algebraic expression?

1. Variables
2. Constants
3. Operators
4. All of these

Q. I have x apples. Now, my friend has six more than 3 times the number of apples I have. What will be the number of apples with my friend?

1. x+6
2. 3x
3. 3x+6
4. 6x

Q. How many variables are present in the given expression $5x+6y$ ?

1. 4
2. 5
3. 2
4. 3

Q.

A variable is a/an ___ .

1. mathematical statement

2. constant

3. symbol to represent an unknown quantity in an expression

4. operator

Q.

If $y$ is expressed in terms of a variable $x$ as $y=f\left(x\right)$ then $y$ is called_____

Q. “ If –x is multiplied by 7 and the product is added to 11” is expressed as ____x + 11.

Q.

__ is a mathematical phrase that containsordinary numbers, variables (like x or y) and operators (like add, subtract, multiply, and divide).

Q. An entity whose value is unknown is called a ___.

Q. Which of the following constitute an algebraic expression?

1. Variables
2. Constants
3. Operators
4. All of these

Q. "2a + 6 = 20" is an algebraic expression.

1. True
2. False

Q. Find the solution of the equation $\frac{5x+1}{2}=23$.

1. x = 7
2. x = 8
3. x = 9
4. x = 10

Q. 'a + 2b < 7' is an equation.

1. True
2. False

Q.

In the equation $x=10y-24$, sum of the coefficients of dependent and independent variables is ___.

Q.

Fill in the blanks:

(iv) If one pen costs ₹$x$, then the cost of $9$ pens is _____.