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How do I make y the subject of an equation? For example in 9x = 3x + 2y.

There are several ways we can rearrange algebraic formulae in order to change the subject. Changing the subject basically means changing the variable (letter) that we are trying to find out, so getting the l...
AJ
Answered by Abbie J. • Maths tutor
7242 Views

Why does integration by parts work?

Recall the product rule for differentiation: the derivative of uv is equal to u'v+uv'.If we use the fact that integration reverses differentiation (so the integral of f' is f), then we calculate that uv is e...
TB
Answered by Thomas B. • Maths tutor
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The point P(-3,9) belongs to a line intercepting the origin. Find the equation of the line.

We are told that the line passes through the origin O (0,0) and the point P (-3,9). First we need to find the gradient of the line m; this is given by m = (change in y)/(change in x), hence m = (9-0)/(-3-0) ...
VB
Answered by Valeria B. • Maths tutor
4033 Views

Solve algebraically the simultaneous equations: x^2 + y^2 = 25 and y - 3x = 13

Firstly we should look at the question and notice that the two possible methods are substitution or elimination. We should then notice that since one equation is a quadratic and the other linear, then the el...
AS
Answered by Aviv S. • Maths tutor
4440 Views

A curve has equation 2(x^2)+3x+10. What is the gradient of the curve at x=3

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Answered by Tom E. • Maths tutor
4160 Views