exam Maths Puzzle Numerical Ability

Solve by the addition method.
7x-4y=-3
x+2y=3

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exam Other Question

Hello, how do i simplify (9 - 5i)(1 + 3i) How do I express his product in the simplest form?

a(squared)-b(squared) over a(to the fourth power)b times ab(b is squared) over 3a+3b