book Maths Puzzle Numerical Ability

y= - 3x -1 how do you do this?

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book Other Question

a straight line with the slope 5 contains the points (1,2) and (3,K). Find the value of K. Hello I am trying to find out if we are doing this problem correctly
5.4+3(8-5)

8-5=3
5.4=20
3.3=9
20+9=29

Please help