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So let's use 2x + 5y = 11 and 3x - 5y = 4 as our example.In these equations we have 2 unknown variables, x and y which we are trying to work out. The numbers in-front of the letters are the amount of time...

The equation of the line is y=x³+7x²+1To find the equation for the gradient of the line, we need to differentiateDifferentiating gives us dy/dx = 3x²+14xWe can now find th...

7700 x 1.2 = 9240 (total cost of car)12 x 642.5 = 7710 (total cost of instalments)9240 - 7710 = 1530Answer = £1,530

use the product rule as well as chain rule. We require the product rule when there is are variables both outside and inside the brackets. The chain rule is only utilised when we have one variable.

This is a simple C1 question on basic integration.I find it best to think of integration as 'anti-differentiation' and it's far more simple. Take each power, add one to it, before dividing into t...