Verified answer

1) x + y = 5

y = 5 - x

y = -x + 5

k = - 1 , l = 5

2) 2x + y = -3

y = -2x - 3

k = - 2 , l = - 3

3) 3x - 2y = 6

-2y = -3x + 6

k = , l = - 3

4) 10x + 100y = 200

100y = -10x + 200

k = , l = 0,5