A: Drawing is actually a very simple process. As long as you find the key corresponding points in the coordinate system, you can probably know the direction of the figure from the rest.

1, draw a straight line: mainly grasp two points: 1. Intersect with the x axis; 2. the intersection with the y axis; The straight line between these two points is a graph.

2. Draw a quadratic curve: mainly a parabola; 1, determine the top of the parabola; 2. Opening direction; 3. Intersection point with X axis and Y axis (if there is no intersection point, it is best to draw it); These four points are drawn accurately. According to the values of x and y, find the corresponding points and connect them smoothly. This is the image of the function. Besides the above four points, you can draw in other directions you know.

Other quadratic curves are much simpler than parabolas. Just get to the point and draw. Practice a few more times and you'll be proficient. Skilled, any picture is not a problem.