Qionglai Chengmendong Fortune-telling

Solution: (1) It is known that the ordinate of point A and point B is -4.

y = - x？ Let y =-4, x =-2 or x = 2.

Then A(-2,-4) B (2,-4)

∴ AB = 4

(2) This question is to compare the absolute values of the coordinates of two points on a parabola with abscissas of-1. 1 and 1. 1 with 1.4.

If the absolute value of the ordinate is less than or equal to 1.4, it can be passed; If the absolute value of the ordinate is greater than 1.4, it cannot pass.

y = - x？ Given X = 1, Y =- 1.2 1.

Therefore, the van can completely pass through the city gate hole.