exam Maths Puzzle Numerical Ability

Assume that y varies directly as x. Find y when x=54 if y=1/4 when x=3/2

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exam Other Question

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 6x-y=-2
-18x+3y=4