If the system of equations `2x+3y=7,\ \ \ 2a x+(a+b)y=28` has infinitely many solutions, then (a)`a=2b` (b) `b=2a` (c) `a+2b=0` (d) `2a+b=0`

If the system of equations 2x+3y=7,\ \ \ \ (a+b)x+(2a-b)y=21 has infinitely many solutions, then

If the system of equations 2x+3y=7,quad 2ax+(a+b)y=28 has infinitely many solutions,then a=2b (b) b=2a(c)a+2b=0 (d) 2a+b=0

If the system of equations 2x+3y=7, 2ax+(a+b)y=28 has many solutions, then _______

If the system of equations 2x+3y=7,quad (a+b)x+(2a-b)y=21 has infinitely many solutions,then a=1,quad b=5( b) a=5,b=1(c)a=-1,quad b=5(d)a=5,quad b=-1

Values of a and b so that system of equations 2x + 3y = 7 and 2 ax + (a +b) y = 28 has infinitely many solutons are

If the system of equations 2x + 3y = 7 and 2ax + (a + b) y = 28 has infinitely many solutions, then which one of the following is correct ?

If the pair of equations 2x+3y=11 and (a+b)x+(2a-b)y=33 has infinitely many solution then a)a=-1,b=5 b)a=1,b=5 c)a=5,b=1 d)a=5,b=-1

If the system of equations x-2y+3z=9 2x+y+z=b x-7y+az=24 , has infinitely many solutions, then a - b is equal to ...........

If the system of equations x - 2y +z = a , 2x + y - 2z = b, x +3y - 3z = c, has at least one solution, then a) a + b + c = 0 b) a - b + c = 0 c) -a + b + c = 0 d) a + b - c = 0

The number of real values of lambda for which the system of linear equations 2x+4y-lambda z=0,4x+lambda y+2z=0,lambda x+2y+2z=0 has infinitely many solutions,is: (A)0(B)1(C)2(D)3