Top answers

How can I maximise my performance and efficiency in an exam?

Confidence in your mathematical ability and subsequent answers in an exam is key. During an exam you should be confident with the answers that you are giving which can be achieved with steady revision and at...
JS
Answered by James S. • Maths tutor
3920 Views

The two points (4,9) and (2,3) are on line A. A second line, line B is perpendicular to line A and goes through the point (2,3). What is the equation of line B?

Step 1, find the gradient of line A: gradient = change in y/change in x = (y1 - y2) / (x1 - x2) = 9-3/4-2 = 6/2 = 3Step 2, find the gradient of line B: as the two lines are perpendicular, the gradient of lin...
GW
Answered by Georgia W. • Maths tutor
3389 Views

What is a derivative and how are they used?

A derivative is a function that tells us the gradient of a curve at any point. Say you have a function like f(x)=x 3 +x 2 and you want to know when the function is stationary, i.e. has a gradient of zero. We...
NS
Answered by Nikhil S. • Maths tutor
4305 Views

3x + 2 = 11. what is x?

3x + 2 = 11 . 3x = 9 . x=3 .
EV
Answered by Emma V. • Maths tutor
16401 Views

y = (x/3) - 14. Rearrange this equation to make x the subject.

The aim of this question is to end up with 'x' standing by itself on one side of the equation. The key principle to achieve this is to understand that whatever you do to one side of the equation, you have to...
MG
Answered by Maximilian G. • Maths tutor
9940 Views