Straight line

Straight line

1. Y=mx+c

   • m=gradient
     • same means they are PARALLEL
     • = to tangent of angle between line and + x-axis
     • Perpendicular lines
       • m1xm2=-1
   • c= y intercept

2. y-b=m(x-a)

   • a,b on the line

3. distance formula

   • AB distance=square root of (x2-x1) squared + (y2-y1) squared

4. Mid-point

   • for x, m=x1+x2 over 2
   • for y, m=y1+y2 over 2

5. Colinearity

   • gradient =
   • common point