exam Maths Puzzle Numerical Ability

solve systems of linear equations by using the addition or substitution method

x+2=y
x+y=6

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exam Other Question

a^2b/b^2a * ab-b^2/ab-a^2 the fast freight train made the trip in 6 hours. The next day the slow freight train made the same trip in 8 hours. What was the speed of the slow freight train if the fast freight train traveled 20 mph faster than the slow freight train?