book Maths Puzzle Numerical Ability

I need the equation of the line with the given slope and y intercept. I can plot, but this is driving me crazy. These are two I need. Of course, I realize you can only answer on

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book Other Question

knowing one kilo = 2.205 pounds. how many kilos is 100 pounds? Find two positive real numbers that differ by 1 and have a product of 1.