# Evaluate Expressions

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Evaluate expression means to evaluate or solve the expressions which involves operation like multiplication, division, addition and subtraction. Constants are the fixed numeric value and variables are alphabetic characters which symbolizes a value which we have to find out. Variables can be symbolised by the variables such as a, b, x or y etc. For better understanding purpose, let us actually evaluate some expression.

Question 1:- Evaluate the value of a from the following expression 3a + 5 = 7

Solution 1:- To evaluate this expression we follow some steps:

Step 1 According to first step we subtract the constant value 5 from both sides of expressions, as shown below

3a + 5 – 5 = 7 – 5

So, 3 a = 2

Now dividing both sides by 3, we will get

3a/3 = 2/3

So a = 2/3

Question 2:- Evaluate the value of x in the following equation x/2 + 8 = 16

Solution:- Given expression is:-

x/2 + 8 = 16 + 8/2

Step 1:- First of all we will solve right hand side

We get,           x/2 + 8 = 16 + 4

Therefore,       x/2 + 8 = 20

Step 2:- Now we will subtract 8 from both sides,

We get,            x/2+8-8 = 20-8

Therefore,       x/2 = 12

Step 3:- Finally to evaluate the value of x, we need to multiply by 2 on both sides,

We get,            x/2 * 2 = 12 *2

Therefore,       x/2 * 2 = 24

Hence   x = 24 is the final answer.