<p>If the slope of a line is -4/5. What is the slope if it is reflected over the y axis?</p>
<p>It would be 4/5. You just flip the sign.</p>
<p>ohhhh so reflection over both X and Y axis just involve flipping the sign?</p>
<p>For a line, yeah. Notice if you flip the point (x, y) over the x-axis you’ll get (x, -y), which means the slope goes from y/x to -y/x and if you flip the point (x, y) over the y-axis you’ll get (-x, y) which means the slope goes from y/x to y/(-x). Either way the sign changes.</p>