Question

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Answer 1

Ответ:

$3x + 10y = 12 \\ 12x - 5y = 3$

$3x + 10y = 12 \\ x = \frac{1}{4} + \frac{5}{12} y$

$3( \frac{1}{4} + \frac{5}{12} y) + 10y = 12$

3/4+5/4y+10y=12

3/4+45/4y=12

3+45y=48

45y=48-3

45y=45

y=1

$x = \frac{1}{4} + \frac{5}{12} \times 1$

$x = \frac{2}{3}$

$(x.y) = ( \frac{2}{3} .1)$

$3 \times \frac{2}{3} + 10 \times 1 = 12 \\ 12 \times \frac{2}{3} - 5 \times 1 = 3$

$12 = 12 \\ 3 = 3$

$(x.y) = ( \frac{2}{3} .1)$

Answer 2

Ответ:

{3x+10y=12,

{12x-5y=3;|*2

{3x+10y=12,

{24x-10y=6;

{(10y-10y)+(3x+24x)=12+6,

{24x-10y=6;

{27x=18,

{24x-10y=6;

{x=2,

{24*0,5-10y=6;

{x=2,

{-10y=-6|:(-10);

{x=2,

{y=0.6.

(2;0,6)

Объяснение:

Проверка: