Maths

>

GCSE

>

Rates of Change

>

How do you...

Question
# How do you find the rate of change?

1 year ago

·

128 Replies

·

4487 views

V

Vickie Shanahan

128 Answers

A

Archita Sinha

The rate of change on a line graph is called the gradient and is calculated by the change in y axis/ change in x axis. What this means is that you find 2 points on the line and find the difference between the y coordinates and divide that by the difference in x axis.

Fiaraz I
Verified Sherpa Tutor ✓

Qualified Teacher, Tutor, Examiner, STEM ambassador and Xprize Alumni

3 reviews

if you are given a graph then draw a tangent as accurately as you can(doesn't matter if its perfect) and use change in y divided by change in x for your straight line to get the gradient which is the rate of change. just watch your units it will ber per second or per minute, something like that depending on the experiment

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
G

George Asquith

The rate of change is how much one quantity changes per unit of another amount. Normally this is how much y changes for every set amount that x increases or decreases. This is the same as the gradient (in straight lines gradient is fixed and is shown as m in y=mx+c, in other graphs, the gradient changes). This can be calculated by having two points each with x and y coordinates. y1-y2 divded by x1-x2.

M

Michail Lazos

The rate of change is difference of y divided by difference of x. In other words it is the derivative at a given point.

A

Aishwarya Bandaru

**The rate of change is also known as the gradient or slope.**

**Rate of change = (change in quantity 1) / (change in quantity 2)**

**Given 2 points (x1, y1) and (x2, y2), the rate of change between them is:**

**Δy / Δx = (y2 - y1) / (x2 - x1)**

M

Melisa

The rate of change = change in y over change in x , if you are given 2 coordinates e.g (2,0) (3,3) and you want to find the rate of change. You would simply do 3-0 / 3-1 which would give you 3/2. This will give you a gradient y=3/2x + c. To find c you would simply sub one of the coordinates back in to this equation.

A

Ajit Kumar

Rate of Change is a general concept and it is applied in various subjects like Maths and Science. Let's understand it by taking an example.

In Time T, I reached from D1 to D2. What is the Rate of change.

So for this, Let's calculate

the Change in Distance= D2-D1

time taken = T

So, Rate of Change = (D2-D1)/ T

i.e change in distance per unit time. This is Rate of change.

A

Anzumana

To find rate of change on a linear graph (straight line) :

1) You have to pick two points on the line

2) Measure the distance in the y axis and the distance in the x axis between the points (you can sketch a right triangle under the points to make this easier)

3) Put the values you got into the formula: change in y divided by change in x

A

Ashan Dayananda

In different situations, we have to calculate rate of change. That means we have given two points in a functions and just like slope between those points. When x=a , f(a) and x=b, f(b) , then rate of change between a & b could be defined by

Rate of change =[ f(b) - f(a) ] / (b - a)

Ciarán
Verified Sherpa Tutor ✓

MPhys Theoretical Physics from the University of St Andrews

The rate of change is a way to measure how fast something is changing. To find the rate of change, we use the formula:

"rate of change = (change in y) / (change in x)"

This formula helps us to find out how much y changes for every 1 unit change in x.

For example, if we have a point A (2,4) and a point B (4,8), we can find the rate of change by using the formula.

(change in y = 8 - 4 = 4) / (change in x = 4 - 2 = 2) = 2

So, the rate of change is 2, meaning that for every 1 unit increase in x, y increases by 2 units.

This formula is especially useful when we have a graph and we want to know how steep the line is. The steepness of the line is also known as the gradient, the bigger the gradient the steeper the line, the smaller the gradient the flatter the line.

In short, the rate of change is a way to measure how much something is changing over time. It is a fundamental concept in mathematics and physics, and it is important for understanding how things change and how to model those changes.

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
C

Chirayu Joshi

Generally, Rate Of Change problems can solve by **R = D/T**, OR rate of change equals the distance traveled divided by the time it takes to do so.

J

Jess

The change in the y axis divided by the change in the x-axis

Jaymen V
Verified Sherpa Tutor ✓

Exceptional Maths tutor with specialist knowledge in KS3 and GCSE Maths

The rate of change is given by the change in y over the change in x. It explains how the variable plotted on the y axis changes in respect to x. For example on a distance time graph the rate of change is given by the change in distance over time so therefore is speed.

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
O

OLAJIDE AYODELE

distance travelled divided by the time

Richard S
Verified Sherpa Tutor ✓

Highly experienced teacher who inspires a love for Mathematics

The rate of change is the change in the y divided by the change in x.

It can be found by working out the gradient at that point by drawing a tangent at that point.

It can also be worked out by differentiating the function.

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.Think you can help?

More Maths GCSE Questions
##
Need
a GCSE
Maths
tutor?

Get started with a free online introductions with an experienced and qualified online tutor on Sherpa.

Find a GCSE Maths Tutor