Question

if 10+y=31 then what is the value of 'y'?​

Answer 1

Answer :-

$\longmapsto\sf 10 + y = 31$

Transposing y from LHS to RHS, changing it's sign,

$\longmapsto\sf y = 31 - 10$

Subtracting 10 from 31,

$\longmapsto\underline{\boxed{\sf y = 21}}$

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Verification :-

• To check our answer, let's put 21 in the place of y and check whether LHS = RHS.

LHS

$\hookrightarrow\rm 10 + y$

Substituting the value of y,

$\hookrightarrow\rm 10 + 21$

Adding 21 to 10,

$\hookrightarrow 31$

RHS

$\hookrightarrow\rm 31$

LHS = RHS.

Hence verified!

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Know more :-

What is a constant?

• A symbol which has a fixed value is called a constant.

What is a variable?

• A symbol which can be given various numerical values is called a variable.

Answer 2

Answer:

$10+y=31\\y=31-10\\y=21$