This post is similar to the group activity on page 259 of your text. In this post you will apply multiple skills learned throughout chapter 3 of the text. You will use the knowledge of forming ordered pairs, plotting ordered pairs on a rectangular coordinate system to form a line, finding slope given two points, and finding the equation of a line given a point and the slope. You will apply all of this knowledge to your measurements to find an equation that will approximate a person’s height given their forearm length.

  • Your group will consist of yourself and four other friends or family members (do not include classmates) for a total of 5 subjects. Do not use names, refer to them as subjects A, B, C, D and E (or similar).
  • For each subject, record the length of their forearm from elbow to wrist, record this number in inches and then show how to convert it to cm using 1 in = 2.54 cm, round to the tenths. This measurement will represent the subject’s x coordinate.
  • For each subject, record their height in feet and inches, then show how to convert this measurement to cm (1 ft = 12 in, then 1 in = 2.54 cm) round to the tenths. This measurement will represent the subject’s y coordinate.
  • Write each subjects’ x and y coordinates as ordered pairs, (x,y).
  • Plot all ordered pairs on a plane similar to that on page 259 but convert its axes measurements to cm.
  • Select two of the ordered pairs on your graph that seem to follow an upward trend and draw in a line connecting them.
  • Upload only the grid as an attachment to your post.
  • Using the two ordered pairs you selected, show us how to plug them into the slope formula m equals y sub 2 minus y sub 1 over x sub 2 minus x sub 1 to find the slope of your line.
  • Using one of the points that you chose and your slope, plug them into the point slope formula y minus y sub 1 equals m (x minus x sub 1) and solve for y to find the equation of your line in slope intercept form.
  • Using that equation, answer question 6 of the group activity on page 260 Be sure to show your calculations. Convert your answer to feet and inches.

Note: In this discussion, you will not be able to see the posts of other students until you have made a post of your own.

Discussion Submission Instructions

This discussion requires one (1) initial post (IP) and two (2) reply posts (RPs). These posts will be assessed according to the Math Discussion Grading Rubric.

For your one (1) initial post:

  • Click Start a New Conversation, and enter the title and content of your post in the appropriate boxes. Click Post when you are ready to submit.
  • We recommend that you type your post in Microsoft Word, save it to your computer, and then copy and paste the text into Sakai. This way, you reduce the chance of losing your work in the rare case of a technical issue. Do not submit the post as an attachment.
  • Your initial post must be at least 200-250 words in length. Equations are included in the word count.

– Please show how you would check your answer

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