260 Chapter 3 Graphing Linear Equations in Two Variables 3. Select two ordered pairs that seem to follow the upward trend of the data. Using these data points, determine the slope of the line. Slope: 4. Using the data points and slope from question 3, find an equation of the line through the two points. Write the equation in slope-intercept form, y mx b. Equation: 5. Using the equation from question 4, estimate the height of a person whose arm length from elbow to wrist is 8.5 in. 6. Suppose a crime scene investigator uncovers a partial skeleton and identifies a bone as a human ulna (the ulna is one of two bones in the forearm and extends from elbow to wrist). If the length of the bone is 12 in., estimate the height of the person before death.Would you expect this person to be male or female? Section 3.1 Rectangular Coordinate System Key Concepts Graphical representation of numerical data is often helpful to study problems in real-world applications. A rectangular coordinate system is made up of a horizontal line called the x-axis and a vertical line called the y-axis. The point where the lines meet is the origin. The four regions of the plane are called quadrants. 1x, y2 The point is an ordered pair. The first element in the ordered pair is the point’s horizontal position from the origin. The second element in the ordered pair is the point’s vertical position from the origin. Example Example 1 y-axis 6 5 Quadrant II Quadrant I Origin 0 4 3 2 1 21 1 2 3 4 Quadrant III Quadrant IV x-axis 6 543 1 2 3 4 5 6 5 6 (4, 2) Chapter 3 Summary
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