Question

A line passing through the points (2,7)and (3,7)is parallel to the line joining (9,a)and(11,2)find a

Answer 1

Answer:

If two lines are parallel, then their slopes are equal.

Slope of a line passing through A(x1,y1) & B(x2,y2). is equal to (y2-y1)/(x2-x1)

So, (7-7)/(3-2) = (2-a)/(11-9)

→ 0 = 1-(a/2) → a = 2