Question

plz solve this maths question​

Answer 1

$\sf{\underline{\boxed{\large{\blue{\mathsf{Answer}}}}}}$

$\sf{\bold{\green{\underline{\underline{Solution\: 1}}}}}$

• linear equation in one variable means the equation which can be written in form of axbc = , where a , b , c are real numbers .
• Now have a look on each option

$\sf\implies 33z + 5$

• this eq has only one variable therefore this can be an example of liner equation with one variable

$\sf\implies 33x + y$

• this eq has two variable therefore this cannot be an example of liner equation with one variable

$\sf\implies 33x + 5$

• this eq has only one variable therefore this can be an example of liner equation with one variable

$\sf\implies 33y + 5$

• this eq has only one variable therefore this can be an example of liner equation with one variable

Therefore 33x + y is not a linear equation with one variable.

Correct answer :- $\sf{\red{\boxed{\bold{option\:B}}}}$

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$\sf{\bold{\green{\underline{\underline{Solution\: 2}}}}}$

$\sf\implies 2x - 3 = 7$

$\sf\implies 2x = 7 + 3$

$\sf\implies 2x = 10$

$\sf\implies x = \dfrac{10}{2}$

$\sf\implies x =5$

Correct answer:- $\sf{\red{\boxed{\bold{Option\: A}}}}$

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$\sf{\bold{\green{\underline{\underline{Solution\: 3}}}}}$

$\sf\implies 2y + 9 = 4$

$\sf\implies 2y = 4 - 9$

$\sf\implies 2x = -5$

$\sf\implies x = \dfrac{-5}{2}$

$\sf\implies x =\dfrac{-5}{2}$

Correct answer:- $\sf{\red{\boxed{\bold{Option\: D}}}}$

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$\sf{\bold{\green{\underline{\underline{Solution\: 4}}}}}$

$\sf\implies \dfrac{y}{5} = 10$

$\sf\implies y = 10\times 5$

$\sf\implies y = 50$

Correct answer:- $\sf{\red{\boxed{\bold{Option\: C}}}}$

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$\sf{\bold{\green{\underline{\underline{Solution\: 5}}}}}$

• let no. to be added be x

$\sf\implies \dfrac{-7}{3} + x =\dfrac{3}{7}$

$\sf\implies x = \dfrac{3}{7} + \dfrac{7}{3}$

$\sf\implies x =\dfrac{3\times 3 + 7\times 7}{21}$

$\sf\implies x = \dfrac{9 + 49}{21}$

$\sf\implies x =\dfrac{58}{21}$

Correct answer:- $\sf{\red{\boxed{\bold{Option\: B}}}}$

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$\sf{\bold{\green{\underline{\underline{Solution\: 5}}}}}$

• let the breadth be x

$\sf{\pink{\boxed{\bold{perimeter = 2( l + b) }}}}$

$\sf\implies 2 ( 6 + x )= 20$

$\sf\implies 6 + x =\dfrac{20}{2}$

$\sf\implies 6 + x = 10$

$\sf\implies x = 10 - 6$

$\sf\implies x = 4$

• breadth = x = 4cm

Correct answer:- $\sf{\red{\boxed{\bold{Option\: A}}}}$

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