Class 8 Maths Chapter 2 Exercise 2.1 Pdf Notes NCERT Solutions
Class 8 Maths Chapter 2 Linear Equations In One Variable exercise 2.1 pdf notes:-
Exercise 2.2 Class 8 maths Chapter 2 Pdf Notes:-
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Ncert Solution for Class 8 Maths Chapter 2 Linear Equations In One Variable Exercise 2.1 Tips:
Introduction
In the earlier classes, you have come across several algebraic expressions and equations.
Some examples of expressions we have so far worked with are:
5x, 2x – 3, 3x + y, 2xy + 5, xyz + x + y + z, x^2+1, y + y^2
You would remember that equations use the equality (=) sign; it is missing in expressions.
Of these given expressions, many have more than one variable. For example, 2xy + 5
has two variables. We however, restrict to expressions with only one variable when we
form equations. Moreover, the expressions we use to form equations are linear. This means
that the highest power of the variable appearing in the expression is 1.
These are linear expressions:
Here we will deal with equations with linear expressions in one variable only. Such
equations are known as linear equations in one variable. The simple equations which
you studied in the earlier classes were all of this type.
Let us briefly revise what we know:
(a) 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). The expression
on the right of the equality sign is the Right
Hand Side (RHS).
(b) In an equation the values of
the expressions on the LHS
and RHS are equal. This
happens to be true only for
certain values of the variable.
These values are the
solutions of the equation.
(c) How to find the solution of an equation?
We assume that the two sides of the equation are balanced.
We perform the same mathematical operations on both
sides of the equation, so that the balance is not disturbed.
A few such steps give the solution.
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