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

{[7(x-2) + 4] - [2(x-5)+6}] Derek biked 30 km in 1 hour. At the same rate, how far did Derek ride in 20 min?

Please help!

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