Question

तुलनात्मक विधि से बनना हैं
समीकरण हल करे
X + y =7
5x + 12y =7

Answer 1

Answer:

*can't explain it in hindi*

Step-by-step explanation:

x + y =7. -------- (1)

5x + 12y=7 ------(2)

x+y=7 ] multiple with 5

5x + 5y= 35

5x +12y =7

(-) (-) (-)

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0 -7y = 28

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-7y = 28

-y = 28

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7

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y= -4

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Now find x value by putting y= -4 in eq (1)

x + y =7

x + (-4)= 7

x - 4 = 7

x = 7+4

x= 11

Therefor our values are

-4, 11

Answer 2

Answer:

$x + y = 7 \\ x = 7 - y \\ \\ 5x + 12y = 7 \\ 5(7 - y) + 12y = 7 \\ 35 - 5y + 12y = 7 \\ 35 + 7y = 7 \\ 7y = 7 - 35 \\ y = \frac{ - 28}{7} \\ \boxed{y = \: \: \underline{ \underline{- 4}}} \\ \\ x + y = 7 \\ x + ( - 4) = 7 \\ x - 4 = 7 \\ x = 7 + 4 \\ \boxed{x = \: \: \underline{ \underline{11}}}$