If `(r+s)/(x-y)=(3)/(4)`, then `(8r+8s)/(15x-15y)=`

Solve (20)/(x + y) + (3)/(x - y) = 7 and (8)/(x - y)- (15)/(x + y) = 5 .

Solve (20)/(x + y) + (3)/(x - y) = 7 and (8)/(x - y)- (15)/(x + y) = 5 .

(2)/(x)-(3)/(y)=15,(8)/(x)+(5)/(y)=77

(2)/(x)-(3)/(y)=15;-(8)/(x)-(5)/(y)=77

If P is a point (x ,y) on the line y=-3x such that P and the point (3, 4) are on the opposite sides of the line 3x-4y=8, then x >8/(15) (b) x >8/5 y<-8/5 (d) y<-8/(15)

If P is a point (x ,y) on the line y=-3x such that P and the point (3, 4) are on the opposite sides of the line 3x-4y=8, then x >8/(15) (b) x >8/5 y<-8/5 (d) y<-8/(15)

Solve : {:((34)/(3x+4y)+(15)/(3x-2y)=5),((25)/(3x-2y)-(8.50)/(3x+4y)=4.5):}

If 2x=3y and 4y=5z, then z:z=4:3(b)8:153:4(d)15:8

If x=3 and y=4 , find the value of (15x) /(12y)

If (x+y)=8 and xy=15 then the value of (x^3-y^3) is :