Rules for setting an equation — lesson. Mathematics State Board, Class 7.

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Rule 1: A variable is assigned to the value not known or to be found.

Let the number of apples that the boy initially had

$= x$ .

Rule 2: Then, the expressions can be formed in by the conditions specified in the question.

Number of apples given to sister

$= 3$ .

Number of apples left for the boy

$= 2$ .

$–$ $=$ Number of apples the boy is left with.

Rule 3: The expressions are finally equated with the values given in the question.

Number of apples the boy left with:

$x - 3 =2$ .

Thus, the equation set up is

$x-3 = 2$ .

Did you find an error?

3. Rules for setting an equation