exam Maths Puzzle Numerical Ability

solve the system
x^2+y^2=4
4x^2+9y^2=36

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exam Other Question

Find the equation of the line. Note the / constitutes a fraction.

contains (1/3, 12/5) and (4/3, 2/5)

I got y=2x-46/15

Please help. simplify:

i^51