Question

даю 69 баллов Пожалуйста :)
В 1547 первый ненадо все остальные сделать нужно.

Answer 1

1547
$2) \left \{ {{x-8y-17=0} \atop {3x+4y-23=0|*2}} \right. \\ + \left \{ {{x-8y-17=0} \atop {6x+8y-46=0}} \right. \\ \\ \left \{ {{x-8y-17=0} \atop {x+6x-8y+8y-46-17=0}} \right. \\ \\ \left \{ {{x-17=8y} \atop {7x=63}} \right. \\ \\ \left \{ {{9-17=8y} \atop {x=9}} \right.\\ \\ \left \{ {{y=-1} \atop {x=9}} \right. \\ \\ OTBET: (9;-1)$

$3) \left \{ {{15x-11y-47=0} \atop {5x-y+17=0|*(-3)}} \right. \\ + \left \{ {{15x-11y-47=0} \atop {-15x+3y-51=0}} \right. \\ \\ \left \{ {{15x-15x+3y-11y-51-47=0} \atop {5x-y+17=0}} \right. \\ \\ \left \{ {{-8y=98} \atop {5x=y-17}} \right. \\ \\ \left \{ {{y=-12,25} \atop {5x=-12,25-17}} \right. \\ \\ \left \{ {{y=-12,25} \atop {x=-5,85}} \right. \\ \\ OTBET:(-5,85; -12,25)$

$4) \left \{ {{8x-9y-21=0|*3} \atop {3x-2y-12=0|*(-8)}} \right. \\ + \left \{ {{24x-27y-63=0} \atop {-24x+16y+96=0}} \right. \\ \\ \left \{ {{24x-24x-27y+16y-63+96=0} \atop {3x-2y-12=0}} \right. \\ \\ \left \{ {{-11y=-33} \atop {3x=2y+12}} \right. \\ \\ \left \{ {{y=3} \atop {3x=6+12}} \right. \\ \\ \left \{ {{y=3} \atop {x=6}} \right. \\ \\ OTBET: (6;3)$

1548
$1) \left \{ {{0,2x+15y=9,8|*2} \atop {0,75x-10y=-3|*3}} \right. \\ +\left \{ {{0,4x+30y=19,6} \atop {2,25x-30y=-9}} \right. \\ \\ \left \{ {{0,4x+30y+2,25x-30y=19,6-9} \atop {0,2x+15y=9,8}} \right. \\ \\ \left \{ {{2,65x=10,6} \atop {15y=9,8-0,2x}} \right. \\ \\ \left \{ {{x=4} \atop {15y=9,8-0,8}} \right. \\ \\ \left \{ {{x=4} \atop {y=0,6}} \right. \\ \\ OTBET: (4; 0,6)$

$2) \left \{ {{0,3x+0,5y=0|*(-4)} \atop {0,1x+2y=6,5}} \right. \\ +\left \{ {{-1,2x-2y=0} \atop {0,1x+2y=6,5}} \right. \\ \\ \left \{ {{-1,2x-2y+0,1x+2y=6,5} \atop {0,1x+2y=6,5}} \right. \\ \\ \left \{ {{-1,1x=6,5} \atop {2y=6,5-0,1x}} \right. \\ \\ \left \{ {{x=- \frac{65}{11} } \atop {2y=6,5+ \frac{65}{110}}} \right. \\ \\ \left \{ {{x=- \frac{65}{11} } \atop {y= \frac{39}{11}}} \right. \\ \\ OTBET: (- \frac{65}{11}; \frac{39}{11})$

$3) \left \{ {{15x-11y=25} \atop {5x-4y=10|*(-3)}} \right. \\ +\left \{ {{15x-11y=25} \atop {-15x+12y=-30}} \right. \\ \\ \left \{ {{15x-15x-11y+12y=25-30} \atop {5x-4y=10}} \right. \\ \\ \left \{ {{y=-5} \atop {5x+20=10}} \right. \\ \\ \left \{ {{y=-5} \atop {x=-2}} \right. \\ \\ OTBET:(-2;-5)$

$4) \left \{ {{0,7x+6y=27,9} \atop {1,5x-2y=-14,5|*3}} \right. \\ +\left \{ {{0,7x+6y=27,9} \atop {4,5x-6y=-43,5}} \right. \\ \\ \left \{ {{0,7x+4,5x+6y-6y=27,9-43,5} \atop {1,5x-2y=-14,5}} \right. \\ \\ \left \{ {{5,2x=-15,6} \atop {2y=1,5x+14,5}} \right. \\ \\ \left \{ {{x=-3} \atop {2y=-4,5+14,5}} \right. \\ \\ \left \{ {{x=-3} \atop {y=5}} \right. \\ \\ OTBET:(-3;5)$