If `x:y=3:4` and` y:z=8:9`,Find `x:y:z` (a)`9:7:6` (b)`6:8:9` (c)`6:9:7` (d)`8:9:6`

If 5x + 6y : 8x + 5y = 8 : 9 , find : x : y .

If x :\ y=8:9, find the ratio (7x-4y):3x+2ydot

If x/6+x/4=x/2+3/4, then x= (a) 9 (b) 6 (c) -9 (d) 4

Find dy/dx :6x−9+8y=0

if (8x + l3y)/(8x - 13y) = (9)/(7) , find x : y .

If the system of linear equations x+ay+z=3 and x+2y+2z=6 and x+5y+3z=b has no solution, then (a) a=-1,b=9 (2) a=-1,b != 9 (3) a != -1 , b =9 (4) a=1,b != 9

Multiply: 8/(-9)b y(-7)/(-16) (ii) (-8)/9b y3/(64)

If x = 6a + 8b + 9c, y = 2b - 3a - 6c and z = c - b + 3a, find : 2x - y - 3z

Find the locus of the centre of the circle which cut the circles x^2+y^2+4x-6y+9=0 and x^2+y^2-4x+6y+4=0 orthogonally (a) 9x+10y-7=0 (b) 8x-12y+5=0 (c) 9x-10y+11=0 (d) 9x+10y+7=0