exam Maths Puzzle Numerical Ability

The answer to 3y=-4/3x

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Q: For a particular event, 812 tickets were sold for a total of $1912. If students paid $2 per ticket and nonstudents paid $3 per ticket, how many student tickets were sold?
Totally stumped!!!!
what are the real and imaginary parts to these questions:
1.2i-1 + 1/i
2.2i-1/i+1 -i
3.i3(cubed)-1 + i-1/i2(squared) + 10