1), it is known that all pass through point P. Substituting P(t, t-4) into linear function can get the value of t, then substituting it into inverse proportional function can get the value of k, and then the analytical formula comes out.

2) From 1), we can know the analytical expressions of two functions, draw an isosceles trapezoid, establish coordinates and divide the trapezoid equally. According to the image of the function where the vertex is located, let x 1, x2, and the difference between the two cardinality is 6, then we can get y 1, y2. According to the parallel characteristics of AD, BC and y, the coordinate difference can be obtained.

The above are the ideas and methods of solving problems, and the ideas of doing math problems are very important for reference only.