Chapter 4

Question 1

Midpoint Formula

Answer 1

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

Question 2

Distance Formula

Answer 2

square root of (x2-x1)^2 + (y2-y1)^2

Question 3

Intersection Formula

Answer 3

Substitute one equation for y in the other equation. This gives you the x coordinate. Plug the x coordinate into either of the equations to find the y coordinate.

Question 4

How do you find the perpendicular line?

Answer 4

Making the gradient into its negative reciprocal

Question 5

When are lines parallel?

Answer 5

When the gradient is the same

Question 6

What is a vertical line’s gradient?

Answer 6

Undefined

Question 7

Absolute Error Formula

Answer 7

0.5 x Smallest Unit of Measurement

Question 8

Absolute Percentage Error

Answer 8

Just percentage error but without a - or + so
relative/actual x 100

Question 9

Relative Percentage Error and how it differentiates from Absolute Percentage Error

Answer 9

relative/actual x 100.
It is different from Absolute Percentage error because it can be a negative.