数学题What is they-intercept of the line tangent to the circle

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数学题What is they-intercept of the line tangent to the circle x²+y
这是网友给的答案和解题的图片.求问切线AB的斜率怎么算?数字是怎么出来的?

过圆X²+ Y²= 1的切点P（3／5,4 / 5）的切线AB在Y轴上的截距为OB,求OB,
法线OP的斜率k=（4/5）/（3/5）=4/3,切线AB的斜率k1=－1/（4/3）=－3/4,
AB的切线方程,按点斜式有：y－4/5=（－3/4）（x－3/5）=（－3/4）x+9/20
y=（－3/4）x+5/4,x=0时,y=5/4,
切线AB在Y轴上的截距为5/4.

完整题目What is they-intercept of the line tangent to the circle x²+y²=1 at the point (3/5,4/5)?

就是那样算没错相互垂直的两条直线斜率相乘的值为-1 知道这个了再求出OP斜率自然知道AB斜率

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