Lines have only one solution

Find the values of r for which the equations rx-y=3 and 4x-2y=5 will have only one solution.

Lines have infinite solutions

IF the equation ax+by=1, cx ^2 +dy^2 =1 have only one solution then (a^2)/(c ) +(b^2)/(d)=

The system of equations (a+1)x+2y-z=1,ay -2z=2 and (a+2)z=3 have only one solution then a=

The system of equations (a+1)x+2y-z=1, ay-2z=2 and (a+2)z=3 have only one solution then a=

Which of the following sets have only one subset

Find the value of k for which the equations kx-21y+15=0 and 8x-7y=0 will have only one set of solutions.

Find the values of p for which the equations 3x-4y=1 and 9x+py=2 will have only one set of solutions.

Statement: I sin^(-1)x=x has only one solution Statement II: cos^(-1)x=x has only one solution which of the above is true?