11. Which of the following is a vector equation of the line 2x - y = 7? a. [x, y] = [4, 3] + t[1, 2] c. [x, y] = [4, 1] + t[2, -1] b. [x, y] = [2, 7] + t[2, 4] d. [x, v] = [5, 3] + t[-3, -6] 12. Which of the following does not have a normal of [1, 1, 1] ? a. [x, y, z] = [2, 3, 1] + t[-2, 3, -1] c. [x, y, z] = [4, 0, 1] + t[1, 0, -1] b. [x, y, z] = [19, 12, 7] + t[-4, 5, -2] d. [x, y, z] = [0, 0, 0] + t[13, -7, -6]13. The diagram shows a regular octagon. Write a single vector that is equivalent to each vector expression. a. E + E A B H C b. E 73' G D c. E t. + E F E 14. A baseball pitching machine is mounted in the back ofa truck. Ifthe ball is pitched backwards out of the truck at a speed of mo kmfh at the same time that the truck was travelling forward at 100 kmfh, state the resultant vector and describe the motion of the baseball. 15. For what value of k will the vectors [2, 3, k] and [-4, -E, 12] be... a. parallel? b. perpendicular