exam Maths Puzzle Numerical Ability

Solve the following system using elimination.

3x + 6y - 9z = 15
2x + 4y - 6z = 10
-2x - 3y + 4z = -6

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exam Other Question
determine the equation of the line passing through the points (-2, 5), (8,-9), and (0,1). Help!!

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4 + c/4y^2