Math, asked by lakshmiphani83p9588z, 1 year ago

0,5x+0.7y=0.74 : 0.3x+0.5y=0.5

Answers

Answered by prince707
0
5x+0.3x =0.8x : 0.7y+0.5y = 1.2y
0.8x : 1.2y
Answered by aman190k
2
Hey here is your answer
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0.5x+0.7y=0.74 \: \: \: \: and \: \: \\ 0.3x+0.5y=0.5 \\ \\ from \: (1)\: eq. \\ \\ = 0.5x+0.7y=0.74 \\ \\ = \frac{5x}{10} + \frac{7y}{10} = \frac{74}{100} \\ \\ = \frac{5x + 7y}{10} = \frac{74}{100} \\ \\ = 5x + 7y = \frac{74}{10} \\ \\ = 5x = 7.4 - 7y \\ \\ = x = \frac{7.4 - 7y}{5} \\ \\ now \: putting \: the \: value \: of \: x \: in \: equation \: (2) \\ \\ \\ = 0.3x+0.5y=0.5 \\ \\ = \frac{3x}{10} + \frac{5y}{10} = \frac{5}{10} \\ \\ = \frac{3x + 5y}{10} = \frac{5}{10} \\ \\ = 3x + 5y = 5 \\ \\ = 3 \times \frac{7.4 - 7y}{5} + 5y = 5 \\ \\ = 22.2 - 21y + 25y = 25 \\ \\ = 4y = 25 - 22.2 \\ \\ =:y = \frac{2.8}{4} \\ \\ = y= 0.7 \\ \\ now \: . \\ \\ = x = \frac{7.4 - 7y}{5} \\ \\ = x = \frac{7.4 - 7 \times 0.7}{5} \\ \\ = x = \frac{7.4 - 4.9}{5} \\ \\ = x= \frac{2.5}{5} \\ \\ = x = 0.5
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Hope it may helpful to you
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