Math, asked by virksaab1, 1 year ago

solve this
3x+5y=9
5x+3y=7

Answers

Answered by payal138
3
5*3x+5y=9
3*5x+3y=7

15x+25y=45
15x+9y=21

Change the sign n solve it...

16y=24
Y=3/2

Put it in 1 equation.....
X=225/2

payal138: hope it will help u
Answered by TRISHNADEVI
7

\huge{ \underline{ \overline{ \mid{ \mathfrak{ \purple{ \: \: SOLUTION \: \: } \mid}}}}}

\underline{ \mathfrak{ \: \: Given :- \: \: }} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \text{ 3x + 5y = 9 \: \: \: - - - - - - > (1) } \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \text{5x + 3y = 7 \: \: \: - - - - - - >(2) \: }

\underline{ \mathfrak { \:Now,\:}} \\ \\ \rm{(1) \times 3 \implies 9x + 15y = 27 \: \: - - - - > (3)} \\ \\ \rm{(2) \times 5 \implies 25x + 15y = 35 \: \: - - - - > (4)}

 \sf{(4) - (3) \implies \: 16x = 8} \\  \\ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \sf{ \implies \: x =  \frac{8}{16} } \\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \sf{ \therefore \: \red{x = \frac{1}{2}} }

\underline{ \text{ \: Putting the value of \: \red{x} \: in eq. (1) , we get, \: }}

\: \: \: \: \: \: \: \: \: \sf{ 3 \times ( \red{\frac{1}{2}} ) + 5y = 9 }\\ \\ \sf{\implies \: \frac{3}{2} + 5y = 9 }\\ \\ \sf{\implies \: 5y = 9 - \frac{3}{2}} \\ \\ \sf{ \implies \: 5y = \frac{18 - 3}{2}} \\ \\ \sf{\implies \: 5y = \frac{15}{2}} \\ \\ \sf{ \implies \: y = \frac{15}{2} \times \frac{1}{5} } \\ \\ \: \: \: \: \: \: \: \: \: \: \sf{\therefore \: \red{ y = \frac{3}{2}

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \boxed{ \bold{ \:  \: \therefore \: \:   \:  \pink{x =  \frac{1}{ 2}}  \:  \:  \:  \: and \:  \:  \:  \:  \pink{y =  \frac{3}{2}}  \:  \: }}

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