Question 936264

Find the values of c and k such that the straight line through (4,-3) and (-2,-5) is: 

a)parallel to the straight line through      
  (2c,3)and(c,c-3)

b)perpendicular to the straight line through
  (k,k+1)and(2k-1,3k)
<pre><font face = "Tohoma" size = 4 color = "indigo"><b>c = {{{highlight_green(system(4&1/2_or,4.5))}}}
k = {{{highlight_green(4/5)}}}
You can do the check!! 
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