CBSE Class 8CBSE
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Concept of Expression

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  • Number line and an expression

notes

Consider the expression x + 5. Let us say the variable x has a position X on the number line; 

X may be anywhere on the number line, but it is definite that the value of x + 5 is given by a point P, 5 units to the right of  X. Similarly, the value of x – 4 will be 4 units to the left of X and so on.
What about the position of 4x and 4x + 5? 

The position of 4x will be point C; the distance of C from the origin will be four times the distance of X from the origin. The position D of 4x + 5 will be 5 units to the right of C.

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