Question 574651
kx + 4y = 2; (-1,2)
Solution:

k(-1)+4(2)=2
-k+8=2
-k=-6
Answer: {{{highlight(k=6)}}}

3x - ky = 1; 93,40
Solution:
I think the point is (3,4), you forgot to press the shift key. 

3(3) - k(4) = 1
9-4k=1
-4k=-8
Answer: {{{highlight(k=2)}}}


kx - 2y = -10, (-2,5) 
Solution:
k(-2)-2(5)=-10
-2k-10=-10
-2k=-10+10
-2k=0
Answer: {{{highlight(k=0)}}}