Question

For what value of k ,do the equations 3x-y+8=0 and 6x-ky+16=0 represent coincident lines?

Please give me the answer fast because my test is going on
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Answer 1

Step-by-step explanation:

Given equations are 3x−y+8=0 and 6x−ky=−16

For coincident lines, 63=−k−1

⇒21=k1

⇒k=2

For option A:

3k−9=32−9=0

which satisfies R.H.S.

Now for option B:

2k−8=22−8=4−8=−4

which does not satisfies R.H.S.

Answer 2

Step-by-step explanation:

Step-by-step explanation:

Given equations are 3x−y+8=0 and 6x−ky=−16

For coincident lines, 63=−k−1

⇒21=k1

⇒k=2

For option A:

3k−9=32−9=0

which satisfies R.H.S.

Now for option B:

2k−8=22−8=4−8=−4

which does not satisfies R.H.S.

i hope it's helpful to you