exam Maths Puzzle Numerical Ability

Solve by any method: First of what are all the methods?

-4x + 3y = 2
5x - 2y = -3

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exam Other Question

6x+4y=16 Find the product or quotient. Write the answer using exponents.

10^9 x 10^2

Any help with this problem would be GREATLY</b> appreciated:)