exam Maths Puzzle Numerical Ability

solve by graphing; estimate the coordinates of the intersection point to the nearest half unit.
x+y=-2; 2x-y=10

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exam Other Question

Merlin has 20 coins in quarters and dimes. The total value of the coins is $3.95. How many coins of each kind does he have? How do you calculate the positive 4th root of 7?
Thanks!
Daniel