Linear Relationships Flashcards
1
Q
Define
Linear function
A
Any function that, when graphed, forms a straight line.
2
Q
Linear equation
A
y = [a]x – [b]
e.g. y = 4x – 6
3
Q
Define
Gradient
A
A measure of slope/steepness, indicated by the latter m
4
Q
Formula
gradient
A
m = rise/run
5
Q
A gradient is positive if…
A
it slopes upwards from left to right
6
Q
A gradient is negative if…
A
it slopes downwards from left to right
7
Q
A gradient is zero if…
A
the line is horizontal
8
Q
A gradient is undefined if…
A
if the line is vertical
9
Q
Define
Direct Variation
A
Direct variation occurs when one variable is directly effected by the other - for example, if you are paid an hourly wage then your total pay depends directly on how many hours you work.
