exam Maths Puzzle Numerical Ability

Are all real numbers also complex numbers? Are all complex numbers also real numbers?

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exam Other Question

This question needs to be solved with the addition/elimination method.
0.4x-0.1y=0.3
-80x+20y=40 i dont know how to solve any of these problems..i really need help..i cant fail math..please help i have a 5 grade test