Explanation: The equation to find the slope (another word for the rate of change) of the line is (y2-y1)/(x2-x1) when the given points are (x1,y1) and (x2,y2).
When we plug in the given points, (3,-7) and (5,20) we can start solving.
(y2-y1)/(x2-x1) (20-(-7))/(5-3) Two negatives make a positive = (20+7)/(5-3) = 27/2 = 13.5
Hello : if : a <span>≡ 5 ( mod 7) ....(1) b </span><span>≡ 6 ( mod 7) ...(2) (1)×(2) : ab </span><span>≡ 30 ( mod 7) </span>but : 30 = 7×4 + 2 ..... so : 30 ≡ 2 ( mod 7) then : ab ≡ 2 ( mod 7)