book Maths Puzzle Numerical Ability

3x - 7y - 5z = 26
8x - 9y + 2z = -109
-1x -6y + 4z = -26

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book Other Question

Hi I have to create a real-life situation that follows a linear equation, with the independent variable being years. What would the slope tell you about future years? I have tried what whole nummber equals 25 when it is squard and 125 whenit is cubed