Question 1017823
<pre>
{{{"M:"}}}{{{(matrix(1,3,x,",",y))}}}{{{"---->"}}}{{{(matrix(1,3,kx+y,",",3x+ky))}}}

{{{"M:"}}}{{{(matrix(1,3,-1,",",2))}}}{{{"---->"}}}{{{(matrix(1,3,k(-1)+2,",",3(-1)+k(2)))}}}{{{""=""}}}{{{(matrix(1,3,-k+2,",",-3+2k))}}}

Given:

{{{"M:"}}}{{{(matrix(1,3,-1,",",2))}}}{{{"---->"}}}{{{(matrix(1,3,a,",",-7))}}}

Therefore:


{{{(matrix(1,3,-k+2,",",-3+2k))}}}{{{""=""}}}{{{(matrix(1,3,a,",",-7))}}}

   -k+2 = a, -3+2k = -7
                2k = -4
                 k = -2

-(-2)+2 = a  
    2+2 = a
      4 = a

Edwin</pre>