Question

Which situation CANNOT be represented by a linear function?

A) A worker's monthly earning include a bonus of $25 and pay at a rate of $6 per hour he worked that month

b) A student collects 15 pounds of cans every two weeks for a fundraiser.

c) A writer uses twice as many pencils each week as he did the week before.

d) A teacher writes down a check mark for every 15 minutes her students read silently.

Answer 1

c) A writer uses twice as many pencils each week as he did the week before.

Explanation:

C is exponential while the rest are linear. They increase by a set amount over a certain amount of time

Answer 2

c) A writer uses twice as many pencils each week as he did the week before.

Explanation:

A) A worker's monthly earning include a bonus of $25 and pay at a rate of $6 per hour he worked that month

slope = 6 and y intercept = 25

y = 6x+25

b) A student collects 15 pounds of cans every two weeks for a fundraiser.

15 cans every two weeks. This is a line at 15

c) A writer uses twice as many pencils each week as he did the week before.

Week 1 =2

Week2 =4

Week3 = 8

This is exponential growth

d) A teacher writes down a check mark for every 15 minutes her students read silently.

This is a line at 1 checkmark