If 7x +8y=10 and 9x-ky=20 a unique solution then which of the following cannot be the value of k - Maths - Coordinate Geometry

Question

If 7x +8y=10 and 9x-ky=20 a unique solution then which of the
following cannot be the value of k? A) -72/7 B)81/7 C) -67/9 D)
64/9

Amit Kumar Singh · Accepted Answer

Dear student,
Here is your solution
<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_5c30d91f46448%20jpg">
Regards,

If 7x +8y=10 and 9x-ky=20 a unique solution then which of the following cannot be the value of k? A) -72/7 B)81/7 C) -67/9 D) 64/9