`7x+15y =2`
`x-2y=3`

" (2) "11x+15y=-23" & "7x-2y=20

Classify the following pairs of lines as coincident, parallel, perpendicular or intersecting : (i) 6x+14y-16=0 , 12x+28y-32=0 (ii) 3x-4y=8 , 3x+4y=11 (iii) 5x-2y=7 , 2y-5x=-7 (iv) 4x+7y=19 , 7x-4y=-2 (v) x-2y=7 , 4y-2x=13

x+7y=10 3x-2y=7

Solve the following pair of equations by substitution method: 7x-15y=2....(1)x+2y=3....(2)

7x - 2y = 3 , 22x - 3y = 16 .

2x-3y=13; 7x-2y=20

Solve the following system of equations: 11x+15y+23=0,quad 7x-2y-20=0

Solve the system of equation :11x+15y+23=0,7x-2y-20=0

The point (1,2) lies inside and (3,4) outside the circle x ^(2) +y ^(2) - 7x + 15 y - c =0, if