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In the xy-coordinate plane,line M is the reflection of line

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In the xy-coordinate plane,line M is the reflection of line L about the x-axis.If the slope of line m is -4/5,what is the slope of line
别只讲答案,或者哪条定律,求讲解怎么推导验证出来的谢谢
In the xy-coordinate plane,line M is the reflection of line
答案应该是-4/5
因为他说line m是4/5,也就是纵坐标比横坐标是四比五,然后line l 是刚好在x轴反射,所以纵坐标变号,横坐标不变,所以是负四比五
再问： 谢谢那能帮我看下这一题吗：How many integer pairs(m,n) satisfy the statements 0＜m+n＜50 and m/n=8？ 答案是6个我只想出来了5个，能帮忙想一下是哪六个吗
再答： 不好意思，我也只有5个，可能题目有问题吧
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