(b) Find the sum of first twenty terms of the following arithmetic progressions A.P
1 answer:
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The point-slope form: 
m = 3; (-1; 5)
subtitute
y - 5 = 3(x - (-1))
y - 5 = 3(x + 1)
m = 3; (-1; 5)
subtitute
y - 5 = 3(x - (-1))
y - 5 = 3(x + 1)