exam Maths Puzzle Numerical Ability

Find all the points of intersection of the curves x^2+y^2=4 and x+y=2

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exam Other Question

k(3k-1)(k-4) Two trains leave the depot at the same time, one traveling east and the other west. The speed of one train is 9mph slower than the other. If after 4 hours the distance between the trains is 196 miles find the speed of each train.