Mathematical coordinates of the second day of junior high school

(3) The symmetry point of e ﹙1﹣4﹚l:y = x is e' ﹙ 4 ﹣ 1﹚,

Let the straight line passing through d ﹙1,3 ﹚ and 4 ﹙1﹚ be y = kx+b ﹙ k ≠ 0.

k+b=﹣3,﹣4k+b=﹣ 1

The solution is k =-0.4 and b =-2.6.

The coordinates of the intersection q of the straight line E'd and the straight line l can be obtained by solving the equations Y =-0.4x-2.6 and y = x.

x=﹣ 13/7,y=﹣ 13/7

∴Q﹙﹣ 13/7,﹣ 13/7﹚

Bingxin mathematics 0 point

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