What is direct proportion ?

Direct proportion means that as one variable goes up the other goes up by the same factor .

What is inverse proportion ?

Inverse proportion means as one variable goes up the other goes down by the same factor .

IGCSEMathsCambridge (CIE)ExtendedFlashcardsAlgebra & SequencesProportion

Proportion (Cambridge (CIE) IGCSE Maths)

Flashcards

1/13

0Still learning

Know0

FrontDirect Proportion
What is direct proportion?

Enjoying Flashcards?
Tell us what you think

Cards in this collection (13)

What is direct proportion?
Direct proportion means that as one variable goes up the other goes up by the same factor.
True or False?
If $x$ and $y$ are directly proportional, then $x : y$ will always be the same.
True.
If $x$ and $y$ are directly proportional, then $x : y$ will always be the same.
What is $k$ used to represent when working with direct proportion?
When working with direct proportion, $k$ is used to represent the constant of proportionality that connects $x$ and $y$ .
$y = k x$ when $x$ and $y$ are directly proportional.
What does it mean for $y$ to be directly proportional to the square of $x$ ?
If $y$ is directly proportional to the square of $x$ , it means that $y = k x^{2}$ .
True or False?
The graph of two directly proportional variables is a straight line.
True.
The graph of two directly proportional variables is a straight line.
True or false?
When solving a direct proportion problem, one of the first things you should do is find the value of the constant of proportionality $k$ .
True.
When solving a direct proportion problem, one of the first things you should do is find the value of the constant of proportionality $k$ .
What is inverse proportion?
Inverse proportion means as one variable goes up the other goes down by the same factor.
What is $k$ used to represent when working with inverse proportion?
When working with inverse proportion, $k$ is used to represent the constant of proportionality that connects $x$ and $y$ .
$y = \frac{k}{x}$ when $x$ and $y$ are inversely proportional.
True or False?
If $x$ is inversely proportional to $y$ , then $x : y$ will always be the same.
False.
If $x$ is inversely proportional to $y$ , then $x : \frac{1}{y}$ will always be the same.
How would you describe the relationship between $A$ and $B$ if $A = \frac{k}{B}$ ?
If $A = \frac{k}{B}$ , it means that $A$ is inversely proportional to $B$ .
What is the equation for $A$ in terms of $B$ if $A$ is inversely proportional to the square of $B$ ?
If $A$ is inversely proportional to the square of $B$ , then $A = \frac{k}{B^{2}}$ .
True or False?
The graph of two inversely proportional variables is a straight line.
False.
The graph of two inversely proportional variables is a not a straight line.
What is the formula for $y$ in terms of $x$ if $y$ is inversely proportional to the cube root of $x$ ?
If $y$ is inversely proportional to the cube root of $x$ , then $y = \frac{k}{\sqrt[3]{x}}$ .
Using laws of indices that can also be written as $y = \frac{k}{x^{\frac{1}{3}}}$ or $y = k x^{- \frac{1}{3}}$ .

Previous:SequencesNext:Coordinate Geometry

Number

Algebra & Sequences

Coordinate Geometry & Graphs

Geometry

Lengths, Areas & Volumes

Pythagoras & Trigonometry

Vectors & Transformations

Probability

Statistics