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
y=3
x+y=24 Identify the axis of symmetry, find the x-intercepts, create a suitable table of values, and then sketch the graph (including the axis of symmetry).
y = x2 - 4x