问题标题：
一道英文数学题writeanequationforthelinethatisperpendiculartothegivenlineandthatpassthoughtthegivenpoint:y=(-1/3)x+2;thepointis(4,2)(-10)x+(8)y=3;thepointis(15,12)列如:y=5x+3;thepointis(0,2)y=(-1/5)x-2我
问题描述：
一道英文数学题
writeanequationforthelinethatisperpendiculartothegivenlineandthatpassthoughtthegivenpoint:
y=(-1/3)x+2;thepointis(4,2)
(-10)x+(8)y=3;thepointis(15,12)
列如:
y=5x+3;thepointis(0,2)
y=(-1/5)x-2
我想知道是怎么解的,
盛英回答：
y=(-1/3)x+2;thepointis(4,2)求一条直线垂直于y=(-1/3)x+2,且过点(4,2)：所以所求直线为y=kx+b斜率k=-1/(-1/3)=3所以y=3x+b,把点(4,2)代入,解b=-10所以y=3x-102、(-10)x+(8)y=3化为y=5x/4+3/8所以所求直线为y=kx...
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