exam Maths Puzzle Numerical Ability

please help use the quadratic formula x= -b+ (small dash under plus sign)sqrt (b^2-4ac)/2a find the roots of the equation x^2-4/3x+1/3=0

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exam Other Question
How would I solve the following system of by graphing, and what would the coordinates be?
3x + y = 6
3x - y = 0 MULTIPLY:-4/5X{-3/8}