Question

State whether each of the following functions specifies a direct or inverse relationship and why. See pages 20-24. Use this tutorial as a guide if needed. algebra/08-lines/04-what-is-slope-line-01.

a. y = -10x

b. y= 300 – 5x

c. y = -40 + 10x

d. y = 100 + x

e. y = –8x

Answer 1

a)

Inverse relationship

This is because as x increases, y decreases in value

b)

Inverse relationship

This is because as x increases, y decreases in value

c)

Direct relationship

Reason: This is because as x increases, y also increases

d)

Direct relationship

Reason: This is because as x increases, y also increases

e)

Inverse relationship

This is because as x increases, y decreases in value