Straight line equation review (2) ppt (Shanghai Education Edition) courseware

Question 2: Knowing the straight line l: y = kx + 1 and two points A (? 1,5), B (4,? 2), if the straight line l intersects with the line segment AB, find the range of k. Analysis: When the straight line intersects the line segment, the two ends of the line segment are on the opposite side of the straight line or on the straight line. When using the vector to deduce the formula for the distance from a point to a straight line, we used the case where the normal vector of the point and the straight line point to the same side and the opposite side.

A teapot is a vessel used for steeping tea leaves or an herbal mix in boiling or near-boiling water, and for serving the resulting infusion which is called tea. Dry tea is available either in tea bags or as loose tea, in which case a tea infuser or tea strainer may be of some assistance, either to hold the leaves as they steep or to catch the leaves inside the teapot when the tea is poured. Teapots usually have an opening with a lid at their top, where the dry tea and hot water are added, a handle for holding by hand and a spout through which the tea is served. Some teapots have a strainer built-in on the inner edge of the spout. A small air hole in the lid is often created to stop the spout from dripping and splashing when tea is poured. In modern times, a thermal cover called a tea cosy may be used to enhance the steeping process or to prevent the contents of the teapot from cooling too rapidly.


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