Two straight lines intersect in high school mathematics.
Solution: ∵ The straight line L 1: AX+Y = 8 passes through the fixed point M (0,8); The line L2: x-ay = 6 passes through the fixed point n (6,0); ∵ line L 1⊥ line L2, let the intersection point be q. ∴∠ Mqn = 90, MN = 10. () ∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴ 5+(y-4)？ 0? 5=5? 0? 5.