Maths equations

Maths equations

1. x=a lines parallel to the y axis

2. y=b lines parallel to the x axis

3. y=mx lines through the origin

4. y=mx+c lines that go through the y axis

5. px+qy+r=0 a tidier way of writing y=mx+c

6. Parallel= same gradient

7. Perpendicular= times to make -1

8. Gradient m=y2+y1/x2+x1

9. Midpoint= (x1+x2/2, y!+y2/2)

10. Length =