Correct Answer - Option 3 : 9
Given points on I line are A (3, y) and B (2, 7)
m = (y2 - y1)/(x2 - x1)
m1 = (7 - y)/(2 - 3) = (7 - y)/( - 1) = y - 7
Given points on II line are ( - 1, 4) and (0, 6)
m2 = (6 - 4)/(0 + 1) = 2/1
Since I & II lines are parallel,
m1 = m2
y - 7 = 2
y = 7 + 2
y = 9