exam Maths Puzzle Numerical Ability

please help me,
show whether or not(5,3) is a solution of the system:
3x+2y=21
x+y=8

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exam Other Question

An express and local train leave Grays Lake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train. y<2y+3y
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