book Maths Puzzle Numerical Ability

3x+6y=14
x+2y=3

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book Other Question

Identify the shape of the graph, transform it into standard form, and sketch the graph.
4x^2 - 9y^2 - 24x - 36y + 36 = 0 how do i work out 3% solution from a 6% solution of 1.5ml hydrogen peroxide solution?