Question

एक सामायिक समीकरणसोडवा‌‌‌
5x+4y=9 4x+5y=18
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Answer 1

Answer:

Step-by-step explanation:

5x+4y=9 and 4x+5y=18 then

5x+4y+4x+5y=18 +9

9x+9y=27

x+y=27 -9-9

x+y= 27-18

x+y=9

Answer 2

Answer:

x = -3

y = 6

Step-by-step explanation:

$5x + 4y = 9 \\ 4x + 5y = 18 \\ \\ (5x + 4y = 9) \times 5 \\ (4x + 5y = 18) \times 4 \\ \\ 25x + 20y = 45 \\ 16x + 20y = 72 \\ ( - ) \: \: ( - ) \: \: ( - ) \\ - - - - - - - \\ 9x = - 27 \\ x = \frac{ - 27}{9} \\ x = \underline{ \underline{\bf - 3}} \\ \\ 5x + 4y = 9 \\ 5( - 3) + 4y = 9 \\ - 15 + 4y = 9 \\ 4y = 9 + 15 \\ 4y = 24 \\ y = \frac{24}{4} \\ y = \underline{ \underline{\bf 6}}$