exam Maths Puzzle Numerical Ability

Use substitution to solve the system {y = 2-x/2
{x^2+4y = 8

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exam Other Question

How many 6 digit numbers can be made with any combination and permutation of 3 and 7? (e.g. 377777, 737777, 777333, 733733, 333337) An oil tank was 1/10 full then 280 gallons was delivered which made it 8/10 full. If x= the capacity of the oil tank, what equation can be used to find the capacity of the tank?