Ответы и объяснения

2013-05-07T00:59:30+00:00

\left \{ {{4x+2y=-22} \atop {3x-\frac{1}{7}y=-5}} \right. 

 

4x+2y=-22

y=-2x-11

3x-1//7*(-2x-11)=-5

23//7x+46//7=0
x=(-46//7)/(23//7)

x=-2


4*(-2)+2y=-22

14+2y=0

y=-14/2

y=-7


\left \{ {{\frac{2x-4y}{5}=\frac{4x+6y}{3}} \atop {\frac{x+y}{4}=\frac{y-2}{6}}} \right. 

 

(2x-4y)/5=(4x+6y)/3
y=-(14//15)*x/2.8

 

(2x-4y)/5=(4x+6y)/3

x/4+(1//12)*y+(1//3)=0
x/4+(1//12)*(-(14//15)*x/2.8)+(1//3)=0

2//9x+1//3=0
x=(-1//3)/(2//9)

x=-1.5

 

(2x-4y)/5=(4x+6y)/3

-(14//15)*x-2.8*y=0

-14//15*(-1.5)-2.8y=0

1.4-2.8y=0

y=1.4/2.8

y=0.5


// - черта дроби