pure- coordinate geometry of straight line Flashcards
1
Q
formula for gradient
A
m=change in y/ change in x
2
Q
formula for equation of a line
A
equation of a line= (y-y1)=m(x-x1)
3
Q
equation for midpoint
A
midpoint=(x1+x2/2,y1+y2/2)
4
Q
equation for length of line
A
root (y1-y2)squared + (x1-x2)squared
5
Q
if lines are perpendicular
A
m1 x m2 = -1
