Answer:
Question 4. Answer: -3 because 5*(-6)-2y=-24 and you find y and it's -3 because (-6;k) and k is the same as y. Question 5. Answer is y=x+1 because (3;4) is (x;y) and if u put the numbers in the equation u will get the right answer.
Btw if it's not right I'm sorry, this was how i thought.