Co-ordinate geometry Flashcards
1
Q
enjoy the…
A
math test
2
Q
equation of line
A
y=mx+c
m= gradient c= y intercept
3
Q
how to find equation of line if given 2 co-ordinates
A
- substitute coordinates into m=x2-x1/ y2-y1
- then substitute m and x1 and y1 into y-y1=m(x-x1)
- x and y are always unknown in second eq*
- then rearrange and simplify into requested format
4
Q
how to find equation of a line given the gradient and 1 coordinate
A
- sub, m and coordinates (x1 and y1 ) into the equation
y-y1=m(x-x1) - then rearrange and simplify into requested format
5
Q
how to find midpoint of a line
A
(x1+x2)/2 , (y1-y2)/2
then combine points
6
Q
how to find point of intersection of 2 lines
A
do simultaneous equation and combine points of x and y
7
Q
equation to get perpindicular gradient from a gradient of another line
A
m1*m2=-1
