book Maths Puzzle Numerical Ability

knowing one kilo = 2.205 pounds. how many kilos is 100 pounds?

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book Other Question

How do you solve an system by graphing. I see the problem x+y=-5 and-2x+y=1 now I need to figure out how to graph the problem so I can come up with the solution. Thank you! Find the slope of the line whose equation is

3x + 2y = 5