Graphs Flashcards
1
Q
Midpoint
A
[(x1 + x2)/2 , (y1 + y2)/2]
2
Q
Gradient
A
dy/dx = m
3
Q
Perpendicular gradient
A
m1 x m2 = -1
4
Q
Equation of line
A
y - y1 = m ( x - x1 )
5
Q
Discriminant: 2 roots
A
b2 - 4ac > 0
6
Q
Discriminant: 1 or repeated roots
A
b2 - 4ac = 0
7
Q
Discriminant: No real roots
A
b2 - 4ac < 0
8
Q
Form of circle equaion
A
( x + a )2 + ( y + b )2 = r2
