By Richard Courant, Charles de Prima, John R. Knudsen

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2. Add the numbers in A1, B1, and C1 with the result in D1. 3. Add the numbers in C4 and C5 with the result in C6. 4. Subtract the number in B4 from the number in A4 with the result in C4. 5. Multiply the numbers in B2 and B3 with the result in B4. 6. Divide the number in C2 by the number in D2 with the result in E2. 7. Divide the sum of the numbers in B1 and B2 by 2 with the result in B3. 8. Calculate 2x+6 where x is in B3 and the result is in C3. 9. 8 where x is in A5 and the result is in B5.

70. Determine whether the line through (6, 2) and (–3, 5) is parallel to the line through (4, 1) and (0, 5). Level 2 Determine whether the pairs of lines in Exercises 71 through 76 are parallel. 71. y=6x+22 y=6x-17 73. x - 2y = 3 2x + y = 1 75. 4x-3y=14 4x+3y=26 72. 3x+2y= 5 6x+4y=15 74. 3x - 5y = 4 - 6x + 10y = - 8 76. 7x-5y= 6 3x+8y=22 Determine if the pairs of lines in Exercises 77 through 80 are perpendicular. 6x+ 5y=17 10x-12y=22 77. 5x Ϫ8 78. 79. y=3x+14 y=5x- 2 80. 2x-7y=13 7x-2y=21 81. Write the equation of the line through (–1, 5) that is parallel to y=3x+4.

1 Exercises 11 Using Your TI-83/84 The TI-83/84 can be used to calculate values of a function y=f(x) for a single or several values of x. Note: The notation using a box such as ENTER indicates the key to be pressed. Example For y=7x-5, calculate y for x=3, 7, 2, and –12. Here’s how: 1. 2. Select Y= and enter 7x-5 as the Y1 function. Next, we set up a table that will calculate the values of y for values of x listed in the table. e. 2nd WINDOW ) to display the TABLE SETUP screen. Enter 0 for TblStart and press ENTER .