NCERT Exemplar Class 8 Maths Unit 4 Linear Equations in One Variable

Candidates can download NCERT Exemplar Class 8 Maths Unit 4 from this page. The exemplar has been provided by the National Council of Educational Research & Training (NCERT) and the candidates can check it from below for free of cost. It contains objective, very short answer type, short answer type, and long answer type questions. Along with it, the answer for each question has also been provided. From the NCERT Exemplar Class 8 Maths Unit 4, candidates can understand the level and type of questions that are asked in the exam.

NCERT Exemplar Class 8 Maths Unit 4 Linear Equations in One Variable

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NCERT Class 8 Maths Unit 4 is for Linear Equations in One Variable. The type of questions that will be asked from NCERT Class 8 Maths Unit 4 are displayed in the below provided NCERT Exemplar Class 8 Maths Unit 4. With the help of it, candidates can prepare well for the examination.

Main Concepts and Results

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An algebraic equation is an equality involving variables. It has an equality sign. The expression on the left of the equality sign is the Left Hand Side (LHS) and the expression on the right of the equality sign is the Right Hand Side (RHS).
In an equation the values of the expressions on the LHS and RHS are equal for certain values of the variables. These values are the solutions of the equation.
Equations where the expressions which form the equation contain only one variable and the highest power of the variable appearing in the equation is 1, are called linear equations in one variable.
A linear equation may have linear expressions on both sides of the equality sign.
To find the solution of an equation we perform the same mathematical operations on both sides of the equation, so that the balance between the LHS and RHS is not disturbed.
A linear equation may have any rational number as its solution.
In an equation, variables can be transposed from one side of the equation to the other.

Solved Examples

In examples 1 and 2, there are four options given out of which one is
correct. Choose the correct answer.

In examples 3 and 4, fill in the blanks to make the statements true.

In examples 5 and 6, state whether the given statements are true (T) or false (F).

You have to Keep Equations Balanced

In examples 7 to 10 solve each of them.

Check

Verify your answer by adopting some other plan.
e.g. Here in this problem instead of taking perimeter as
sum of its sides, use the formula

4s = 6480 cm
s = 1620 cm
Hence verified.

Think and Discuss

What other values will be needed if instead of square it is a rectangular or circular garden?
What will happen if we have to level the grass inside it instead of fencing the garden?
What will happen if there is a path running inside it?