Question

please solve the question.
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answer with full explanation please.​

Answer 1

$\huge{\green{\boxed{\mathbb{\red{ANSWER}}}}}$

$\frac{x}{2} + y = 0.8 \\ \frac{7}{x + \frac{y}{2} } = 10 \\ = > y = 0.8 - \frac{x}{2} .............(1) \\ and \: \: \: \: 7 = 10x + 5y...............(2)$

Put the value of y in equation (2)

$=> 7 = 10x + 5(0.8 - \frac{x}{2} \\ => 7 = 10x + 4 - \frac{5x}{2} \\ => 7 - 4 = \frac{20x - 5x}{2} \\ => 3 = \frac{15x}{2} \\ => x = 3 \times \frac{2}{15} \\ =>x \:= \: \frac{2}{5}$

Put the value of x in equation (1)

$y = 0.8 - \frac{x}{2} \\ => y = 0.8 - \frac{2}{5 \times 2} \\ => y = 0.8 - 0.2 \\ => y\: = \:0.6 \: \: or \: \: \frac{3}{5}$

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Answer 2

Answer:

( -1,6 ; 0,6)

Step-by-step explanation:

{Х\2+у=0,8   (умножим на 2)

{7:(х+у\2)=10. ( по свойству пропорции)

{Х+2у=1,6  |*10,

 {10х+5у=7. Вычтем из первого уравнения второе.

15у=9

У=3\5=0,6.

Х+2у=1,6  при  у=0,6 имеем  : Х+2*1,6=1,6  , х=-1,6  .

Ответ ( -1,6 ; 0,6)