Question

Kyle wants to find the equation of the line that passes through the points (1, –7) and (–1, 1) . Which set of calculations will help Kyle find the equation of the line?

Answer 1

1) for solve this exercise you must set the following equation to find the slope

m = y2-y1 /x2-x1 , ⇒ m = 1-(-7)/-1-1 ⇒m = 8/-2 -4

now with the equation of the line point slope, for this you have any of the two points given

y-y1 =m(x-x1) ⇒y-(-7) = -4(x-1)⇒y+7 = -4x+4⇒y = -4x+4-7⇒y = -4x-3