Point P is on the line y=5x+3.The coordinates of point Q are

niemanren2022-10-04 11:39:541条回答

Point P is on the line y=5x+3.The coordinates of point Q are(3,-2).If M is the midpoint of PQ,then M must lie on the line
y=5x-7
怎么算的?

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fjsngdbaa 共回答了21个问题 | 采纳率71.4%: 翻译：
点P在y=5x+3直线上.已知坐标Q（3,- 2）.如果M是PQ的中点,则M一定在直线【y=5x-7】上.
不妨设P（a,5a+3）
则M横坐标x=(3+a)∕2,纵坐标y=(5a+3-2)∕2
即a=2x-3 a=（2y-1）∕5
所以2x-3=（2y-1）∕5
化简得：y=5x-7
所以点M一定落在y=5x-7这条直线上; 1年前