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In a sale a bag is reduced by 30%. The bag is now £31.50. Work out the original price of the bag.

£45.00
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Answered by Safiya C. • Maths tutor
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Solve this simultaneous equation: (1) 2x+3y=12 (2) x+4y=11

x=3,y=2
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Answered by Safiya C. • Maths tutor
4235 Views

How do you solve simultaneous equations?

Simultaneous equations have two unknowns, you need to find out one of the unkowns (eg. x) in terms of the other (e.g. y) in order to solve both unknowns. Using these two examples (x and y) we can construct a...
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Answered by Charlie O. • Maths tutor
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Differentiate 3x^(2)+xy+y^(2)=12 with respect to x

this is implicit differentiation. We start by differentiating 3x^(2) to get 6x (lower the power by 1, multiply by the original power). For xy, we use the product rule, giving us y + (x)dy/dx (this is the imp...
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Answered by Noyonika L. • Maths tutor
4852 Views

How do I use the product rule for derivatives?

Imagine a function f(x)=g(x)*h(x) [that is, two functions multiplied together] To find the derivative, f'(x)=g'(x)*h(x) + g(x)*h'(x) For example, f(x) = (3x 2 )*(cos x ) [g(x)=3x 2 , h(x)=cosx] f'(x) = (6x) ...
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Answered by James W. • Maths tutor
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