Question

Find the value of k so that (–1, 5) lies on kx – 4y – k = 0.

A. 20

B. –10

C. infinite number of solutions

D. no solution

Answer 1

Can anyone explain how to solve this?

Answer 2

plugin x = -1, and y = 5

Answer 3

in the given equation

Answer 4

kx – 4y – k = 0
^ ^

Answer 5

k(-1) - 4(5) - k = 0

Answer 6

solve k

Answer 7

Does k equal -20?

Answer 8

k(-1) -20=0, k(-1)=20, k=-20

Answer 9

Is this correct?

Answer 10

you forgot the -k in equation. do it agian :)

Answer 11

k=-10.....

Answer 12

-k-20-k=...-2k-20=...-2k=20=.....k=-10

Answer 13

k(-1)-k = 20. How do I continue from here?

Answer 14

-k-k=20........-2k=20...........k=-10

Answer 15

Thank you soooo much :)

Answer 16

yw :)