- Solution of simultaneous linear equations
The numerical values of the two unknown variables in a pair of linear equations in two
variables are said to be the solution of the equations.
Eg. :
Consider, x + y = 5 - (1)
x – y = 1 - (2)
Adding equations (1) and (2),
2x = 6
x = 3
Substituting the value of x in (1)
3 + y = 5
y = 5 -3
y = 2
Therefore the solution of the two simultaneous equations is (3, 2)
The idea may be explained to the child through spatial forms of exercises. The process
of solving simultaneous equations is to be emphasized more than once until the child
is clear with the idea.
- Sequence
Numbers which follow a definite pattern are said to form a sequence.
Eg. :1, 2, 3, 4, 5, ... the difference between numbers is ‘1’
2, 4, 6, 8, 10, ... the difference between numbers is ‘2’
1, 4, 9, 16, 25, ... the difference between squares of 1, 2, 3, 4, 5, etc.
Note : Each element in a sequence is called a term. The first term is denoted as t 1 , the
second term as t 2 and so on.
As this is a non-visual logic, the child with visual impairment can understand through
adequate description.
