Question

For what value of K, do the equations 2x-3y +10=0
and 3x+ky+15=0 to represent coincident lines.
a) - 9/2 (b) -11 (c) 9/2 (d)-7​

Answer 1

Answer:

I think the question is wrong.

Step-by-step explanation:

As to make two equation coincident their coefficient should be in the form of :-

a1/a2 = b1/b2 = c1/c2

and in your questions nor the option of b1/b2 is there also no c1/c2 is also not equal.

Hence I think the question is wrong.

I am not sure though.

Answer 2

Answer:

-9/2

Step-by-step explanation:

given: equations representing coincident lines i.e., a^1/a²=b^1/b²=c^1/c²

so,

2x/3x=-3y/ky=10/15

a^1/a² and c^1/c² is in form of 2/3 so hence b^1/b² would also be in that form and to remove the negative sign from b^/ we keep k as a negative number

2/3=-3/k

2k=-3×3 ( by cross multiplication)

k=-9/2