tag:blogger.com,1999:blog-1579916493674083376.post5096937718584707503..comments2010-08-25T21:27:07.625+08:00Comments on SST Class 103 MathsBlog: new summary-tan kein shuenMr Edmund Ngnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-1579916493674083376.post-50402672131653567922010-08-25T21:27:07.625+08:002010-08-25T21:27:07.625+08:00I think your question meant "why must both th...I think your question meant "why must both the two lines be parallel to each other for their x intercept to be the same as the parabola?" Not sure if I got your meaning.<br /><br />I think (not sure if I'm right) the two lines have to be parallel as if you try multiplying two y intercept values from the two lines to get the y intercept of the parabola (forms a straight line), it might not be the same value.Yan Jinhttp://www.blogger.com/profile/17204797078807073658noreply@blogger.com