exam Maths Puzzle Numerical Ability

Using Multiplication First:
Use linear combinations to solve the system of linear equations.

9x - 3z = 20
3x + 6z = 2

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exam Other Question

55 to 100 ratio as a
fraction in lowest terms To prove triangle DEF is congruent to triangle GHK by the SSS Postulate, you must first show that _____, _____, and _____.

Please help. I don't get what they are asking for th