Each equation below represents a family of lines. Describe what the lines in each form have in common. a. y = a + 3x b. y = 5 + bx c. y = a d. x = c

L21 - 9 ex. The base of a triangle is increasing at a rate of 2 ft/sec while the height is decreasing at a rate of 4 ft/sec. How fast is the area of the triangle changing when the base is 6 feet and the height is 10 feet