Jacque's candidates have gained 140,000 supporters.
Explanation:
We know gains 20,000 supporters every week and loses 10,000 every 4 weeks. If so, he will gain 80,000 every 4 weeks (20,000 x 4) and will lose 10,000 every 4 weeks, resulting in gaining 70,000 every 4 weeks (80,000-10,000). Finally, all we have to do is multiply 70,000 x 2, and we get 140,000. Therefore, Jacques candidate will have gained 140,000 every 8 weeks.
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As two points are given and the slope between two points say (a,b),(x,y) and is given by
m=y-b/x-a
For your question
1/2=3-2/6-r
(6-r)=1(2)
6-r=2
r+2=6
r=4