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I、点斜式直线参数方程的标准形式:爸过定点尸。(x。,y。)倾斜角为a的直线的参数方程: 设尸(’,y)是直线上任意一点,令尸.尸,t.那么:戈一劣。=fcosa. y一yo=ts ina。.’.点斜式参数方程的标准形式是:(戈=:。+teo:a烤Ly=y。+t:ioa(t为参数0《a(二)(1)t的系数平方和等于1,它是点斜式参数方程的标准形式.(2)参数t对应于尸(二,y),所以它的几何意义是:0 00一一>< 厂l|l!11、、t=P。尸=(尸和尸。重合)(尸在尸。的上方或右方)(尸在尸。的下方或左方) (3)利用t的几何意义,可以求得直线
I, point oblique linear parameter equation of the standard form: Dad too point fixed corpse. (x., y.) The equation of a straight line whose angle of inclination is a: The corpse (’, y) is a straight line at any point, so that the corpse. = fcosa. y-yo = ts ina. The standard form of the point-slope parametric equation is: () = +. + Teo: a roast Ly = y + t: ioa (t is the parameter 0 "a 1, which is the standard form of a point-slanting parametric equation. (2) The parameter t corresponds to the corpse (2, y), so its geometric meaning is: 0 00 - P. corpse = (corpse and corpse coincidence) (corpse in the corpse of the top or right) (corpse in the corpse of the bottom or left) (3) the use of the geometric meaning of t, you can find a straight line