exam Maths Puzzle Numerical Ability

2x=y=1
2x-y=5
please helpme solve this equation by graphing.i have another problem.a sailboat travels 20miles downstream in 3hrs.it returns in4hrs.find the speed of the sailboat

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exam Other Question
Please help me with this I cannot seem to figure out how to graph this function.
Graph: f(x) = -2x + 2

Thanks for any help you can give. Assume that y varies directly as x. Find y when x=54 if y=1/4 when x=3/2