Straight Lines

Question 1

Distance between points on horizontal and vertical lines.

Answer 1

d=x2-x1 where line is horizontal, and x2>x1

d=y2-y1 where line is verticle and y2>y1

Question 2

Distance between points on a diagonal line

Answer 2

d= square root of (x2-x1) squared+ (y2-y1) squared units

Question 3

Midpoint formula

Answer 3

Midpoint = (x1 + x2/2, y1 + y2/2)

Question 4

Angles and gradient

Answer 4

tanø = m where ø is the angle between line and the positive direction of the x axis