2. You are purchasing copy books on Amazon. Each book costs AED35 and you have an coupon of AED20. Write an equation to represent this if y represents total cost for the books and x represents the number of books. Section 1: Direct Variation (Lesson 3.2) Direct variation: is a relationship that can be represented by a function in the form y = k x x, where k # 0. Constant of variation of a direct variation (k): The constant is the coefficient of x. By dividing each side of y = k x x by x, you can see that the ratio of the variables is constant: y : x = k Question 1: Give an example of an equation that represents direct variation? Question 2: Which of the following equation does not represent direct variation? A) 3x = y By= 5x 2 C) y = -5x - 1 D) 2y = 8xQuestion 3: Suppose y varies directly with x. Write a direct variation equation that relates x and y, given that y = 3 when x = 10. Then nd the value ofy when x = 6 Step 1: Calculate the value of 'k' using the fact that k = y +x Step 2: Use your answer in step 1 to write the direct variation equation in the form y = kx Step 3: Use the equation to calculate the value of y for the given 'X' Question 4: Suppose y varies directly with x. Write a direct variation equation that relates x and y, given that y = 5 when x = 15. Then find the value of y when x = 12