Hot issues：
This module collects the frequently encountered and difficult problems for reference only.
This module collects the frequently encountered and difficult problems for reference only.
Current location：Hot issues > Answer
若$A(m+4，m-9)$在$y$轴上，求$m$的值。
因为$A(m+4,m-9)$在$y$轴上，所以有 \begin{align} m+4=&0\\ =>m=&-4 \end{align} 即，所求的$m$的值为$m=-4$