Question

if (2,-7) is the solution of 8x - ky = -2, find k

Answer 1

Answer:

Put x=2 and y=-7

Step-by-step explanation:

8*2-k*-7=-2

16+7k=-2

Therefore, k=(-2-16)÷7

K=-18/7

Answer 2

Answer:

k = - 18/7

Step-by-step explanation:

Given,

(2,-7) is the solution of 8x - ky = -2

So, x = 2 and y = - 7

put these values in the given equation.

8x - ky = -2

8(2) - k(-7) = -2

16 + 7k = -2

7k = - 2-16

7k = - 18

k = -18/7