explain the points of class of 8 ncert pg no 26
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Answer:
Mathematics N CERT Grade 8, Chapter 2: Linear Equations in One Variable- In this chapter students will get to know about linear expressions in one variable. A short revision of previously discussed topics is done in the beginning.
An algebraic equation is an equality involving variables having equality sign.
After this introduction, Solving equations which have a linear expression on one side and numbers on the other side is explained.
Students can practice the questions based on the same through exercise 2.1. Section 2.3 lays emphasis on Some Applications of linear equations in one variable. A puzzle is given here to make the topic interesting for students. Several solved examples are discussed before moving to the next exercise. These examples are in the form of word problems.
The next topic is Solving equations having the variable on both sides. In this section, students will learn how to solve such equations which have expressions with the variable on both sides.
The expressions forming equations have to be simplified before it can be solved with usual methods.
Some equations may not even be linear in the beginning, but they can be brought to linear form by applying suitable operations like transposing etc.
After discussing some more applications involving age, two digit numbers, dimensions of the given figure etc. the next part of the chapter deals with Reducing Equations to Simpler Form.
The utility of linear equations is in their diverse applications such as:
a. Different problems on number
b. Ages
c. Perimeters
d. Combination of currency notes
The last exercise is based on the same containing 7 questions. For a better understanding of this chapter and to increase the fluency of forming linear equations, students must do a good practice of all solved and unsolved problems.
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