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Okay so first, to make the process more simple, I would suggest collecting all algebraic terms on the same side of the question as to get: 9x-5y=21 and 7y+6x=45 (as it already is). Next, looking at both equa...

You want to take the derivative of both sides of the equation with respect to x which produces an equation in terms of x, y and dy/dx which can then be rearanged. The right side is just 0 since 17 is a const...

Algebra is a part of mathematics in which letters or symbols are used to represent either a known constant or an unknown value. Algebra is often used within formulae in which we can extrapolate an answer, an...

We use factorisation of double brackets to re-express the equation in a more useful form. For this factorisation, we require two numbers that add to make 14 and also multiply to make 40. We notice that the n...

Find the lowest common denominator of either x or y. x in this example. ( 12x ) Multiply both equations such that the x's match this. ( 1) 12x + 8y = 16 & 2) 12x + 15y = 51 ) Combine these formulas by ta...