Math, asked by dilip422331, 4 months ago

(ii) x + y = 3 and 2x + 5y = 9 ( by substitution method)​

Answers

Answered by sumairadoll
1

Step-by-step explanation:

2x+5y=9. equation 1

x+y=3. equation 2

put x=3-y in equation 1

2x+5y=9

2(3-y)+5y=9

6-2y+5y=9

3y=9-6

3y=3

y=3/3

y=1

x=3-y

x=3-1

x=2

Answered by Anonymous
10

Step-by-step explanation:

 \blue{ \bf{ \underline{QUESTION} : }} \\  \\

x + y = 3 and 2x + 5y = 9 ( by substitution method)

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 \boxed{ \huge{ \bold{Given}}}

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  •  \sf{x + y = 3 \:  \:  \:  \:  \:  \: eq(1)}

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  •  \sf{2x + 5y = 9 \:  \:  \:  \:  \:  \: eq(2)}

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 \boxed{ \huge{ \bold{to \: find}}}

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  • x and y value

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 \star{ \pink{ \underline{ \underline{Solution :  - }}}}

 \\

From Equation (1)

 \\  \\  \\

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \sf{x + y = 3}

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 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   : \implies \sf{x  = 3 - y \:  \:  \:  \: eq(3)}

 \\  \\

Puting x value in Equation (2)

 \\

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   : \implies \sf{2x  + 5y = 9}

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\:  \:  \:  \:  \:  \:  \:  \:  \:  \:   : \implies \sf{2(3 - y)  + 5y = 9}

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\:  \:  \:  \:  \:  \:  \:  \:  \:  \:   : \implies \sf{6 - 2y + 5y = 9}

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\:  \:  \:  \:  \:  \:  \:  \:  \:  \:   : \implies \sf{6  + 3y = 9}

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\:  \:  \:  \:  \:  \:  \:  \:  \:  \:   : \implies \sf{3y = 9 - 6}

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\:  \:  \:  \:  \:  \:  \:  \:  \:  \:   : \implies \sf{y =  \cancel \frac{3}{3} }

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\:  \:  \:  \:  \:  \:  \:  \:  \:  \:    \ \sf{ \therefore{ {y =  {\boxed{ \red 1} }}}}

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Puting y value in Equation (3)

 \\  \\  \\

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    \sf{x  = 3 - y \:  \:  \:  \: }

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   : \implies \sf{x  = 3 - 1\:  \:  \:  \: }

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 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    \therefore {\sf{x  =  {\boxed{ \red{9} \:  \:  \:  \: }}}}

============================================

Verification

( Puting x,y value in Both Equation )

 \\  \\  \\

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    \sf{x + y  = 3  \:  \:  \:  \: }

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \: : \implies     \sf{2+1   = 3  \:  \:  \:  \: }

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \: : \implies     \sf{3   = 3  \:  \:  \:  \: }

 \:  \:  \:  \:  \: L.H.S = R.H.S

 \\  \\  \\  \\  \\

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    \sf{2x + 5y  = 9  \:  \:  \:  \: }

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \: : \implies     \sf{2 \times 2 + 5 \times 1   = 9  \:  \:  \:  \: }

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \: : \implies     \sf{4 + 5   = 9  \:  \:  \:  \: }

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \: : \implies     \sf{9  = 9  \:  \:  \:  \: }

 \:  \:  \:  \:  \: L.H.S = R.H.S

We Found,

Both Equation Follow L.H.S = R.H.S So x,y value is Correct

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