Question

Identify which of the following are equations.

i) x – 3 = 7

ii) l + 5 > 9 

iii) p – 4 < 10 

iv) 5 + m = -6 

v) 2s – 2 = 12 

vi) 3x + 5

Answer 1

i) x – 3 = 7 

We know that, a mathematical statement involving equality symbol is called an equation.

x – 3 = 7 has equality symbol.

So, it is an equation.

ii) l + 5 > 9 

We know that, a mathematical statement involving equality symbol is called an equation. 

l + 5 > 9 has no equality symbol. 

So, it is not an equation. [It is an inequation]

iii) p – 4 < 10 

We know that, a mathematical statement involving equality symbol is called an equation. 

p – 4 < 10 has no equality symbol. 

So, it is not an equation. [It is an inequation]

iv) 5 + m = – 6 

We know that, a mathematical statement involving equality symbol is called an equation. 

5 + m = – 6 has equality symbol. 

So, it is an equation.

v) 2s – 2 = 12 

We know that, a mathematical statement involving equality symbol is called an equation.

 2s – 2 = 12 has equality symbol. 

So, it is an equation.

vi) 3x + 5 

It is only an expression. It’s not an equation.