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

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 (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

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 ?

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,\ \ \ 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,quad 2ax+(a+b)y=28 has infinitely many solutions,then a=2b (b) b=2a(c)a+2b=0 (d) 2a+b=0

Find the value of k for which the system of equations 2x + 3y=7 and 8x + (k +4)y -28 =0 has infinitely many solution.

If the system of equations 2x-3y+5z=12, 3x+y+lambdaz= mux7+y+8z=17 has infinitely many real solutions, then lambda+mu =

Show that the system of equations 4 x + 6y = 7, 12 x + 18 y = 21 has infinitely many solutions.

If the system of equations 2x+3y=5,\ \ \ \ 4x+k y=10 has infinitely many solutions, then k= (a) 1 (b) (c) 3 (d) 6