By Rotman J.J.

ISBN-10: 0821847414

ISBN-13: 9780821847411

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SOLUTION y To ﬁnd the x-intercept, let y = 0. 2x − 3y = 6 2x − 3(0) = 6 x =3 2 (3, 0) −4 −2 4 2 To ﬁnd the y-intercept, let x = 0. 2x − 3y = 6 2(0) − 3y = 6 y = −2 x −2 (0, −2) −4 Graph the points (3, 0) and (0, −2). Draw the line through these two points. TRY THIS Use intercepts to graph the equation 5x + 3y = 15. Horizontal and Vertical Lines y For the horizontal line at right, the formula 3 − 3 = 0 , which is 0. for slope gives ᎏ ᎏ ᎏᎏ 2 − (−3) 5 4 (–3, 3) A horizontal line is a line that has a slope of 0.

F. Use the appropriate least-squares line to predict the height of a man who wears size 12 shoes. g. Use the appropriate least-squares line to predict the height of a woman who wears size 8 shoes. a. 42 CHAPTER 1 VIRGINIA KENTUCKY NORTH CAROLINA L. Douglas Wilder served as governor of Virginia from 1990 to 1994. S. history. TENNESSEE SOUTH CAROLINA ARKANSAS ALABAMA GEORGIA MISSISSIPPI TEXAS LOUISIANA FLORIDA Number of African American Elected Ofﬁcials 1940 APPLICATIONS 1950 1960 1970 1980 1990 1941 1947 1951 1965 1970 1975 1980 1985 2 6 15 87 103 1913 2981 3801 The time line above shows the number of African American elected ofﬁcials in Southern states from 1941 to 1985.

3. Explain how to ﬁnd the y-intercept for the graph of 2x − 5y = 10. 4. Describe how to write the equation x − y = 2 in slope-intercept form. Guided Skills Practice 5. Find the slope of the line containing the points (−2, 4) and (8, −3). (EXAMPLE 1) 6. Use the slope and y-intercept to graph the equation ᎏ12ᎏx + y = −4. (EXAMPLE 2) 7. y Write the equation in slope-intercept form for the line graphed at right. 2 1 (EXAMPLE 3) 8. Use intercepts to graph −2x − 4y = 8. (EXAMPLE 4) Graph each equation.

### Advanced algebra by Rotman J.J.

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