Question

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#1522

Answer 1

1522 .
1) {5(2x+1) -3(x-2y) =4(2x+y); 4(x-4y) +2(5x-11y)=3(3x-1).
{10x+5 -3x+6y=8x+4y ; 4x -16y+10x -22y =9x-3.
{x-2y=5 ;5x -38y = - 3. {x=2y+5; 5(2y+5) -38y= -3 .
10y +25 -38y = -3;
-28y  = -28 ;
y =1.
x =2y+5 =2*1 +5 = 7.
ответ:   (7 ;1).
2)  {2(7x+y) -3(5x-y) =x+y; 3(9x-2y)+4(7x+4y)=8(x+y)+96.
{14x+2y -15x+3y =x+y; 27x-6y+28x+16y=8x+8y +96.
{x =2y; 47x+2y = 96.
47*2y +2y=96;
94y+2y =96;
96y=96;
y=1;
x=2y =2*1 =2 .
ответ :   (2 ;1).