exam Maths Puzzle Numerical Ability

What steps are needed to graph the lines lines: y = 0.15x +0.79 : y = 0.11x - y = -0.85

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exam Other Question

I'm going to guess this would be the correct place for this. I need to solve something called 'the oldest geometry proof. There is a diagram. I will try to explain it. There is Solve for x: a/(x-3a)=b/(x+3b)