X+7 y-5
---- + ---- = -1 x+7 +2y-10= -4 x+2y=-1 5x+10y= -5 13y=-39 y=-3
4 2 x=5
x+10 y+8
------ - ----- = 4 5x+50 - 3y-24=60 5x-3y=34 5x-3y=34
3 5
y=-3
x=5
проверка
(5+7)/4+(-3-5)/2=3-4=-1 верно
(5+10)/3-(-3+8)/5=5-1=4 верно
(x-9)/3 -(y+10)/2=0 2(x-9)-3(y+10)=0 2x-3y=48
(x-7)/4 +(y+10)/8=1,5 2(x-7)+(y+10)=12 2x+y=16 4y=-32 y=-8
x=12
проверка
(12-9)/3 -(-8+10)/2=1-1=0 верно
(12-7)/4 +(-8+10)/8=5/4+2/8=6/4=1,5 верно