Question

The slope of the line joining the points (3, -2) and (-1, y) is -3 then the value of y is *

Answer 1

Step-by-step explanation:

slope m = (y2 - y1) / (x2 - x1)

given : m = -3, x1 = 3, y1 = -2, x2 = -1 , y2 = ?

=> -3 = [y2 - (-2)] / [-1 - 3 ]

=> -3 = (y2 + 2) / -4

upon cross multiplication, we get

=> (-3) × (-4) = y2 + 2

=> 12 -2 = y2

=> y2 = y = 10