Q9 of 112 Page 168

Slope of the line joining the points (3,– 2)and (–1, a) is , then the value of a is equal to

Slope of the line joining the points (3,– 2)and (–1, a) is .


Slope of the line with end points as (x1,y1) and (x2,y2)


is .


∴


Given .


∴


⇒ 2(a + 2) = –3(–4)


⇒ 2a + 4 = 12


⇒ a + 2 = 6 (Divide by 2 on both the sides)


⇒ a = 6–2 = 4


∴ a = 4

More from this chapter

All 112 →
7

Area of the quadrilateral formed by the points (1,1), (0,1), (0, 0)and (1, 0)is

 8

The angle of inclination of a straight line parallel to x–axis is equal to

 10

Slope of the straight line which is perpendicular to the straight line joining the points (–2, 6)and (4, 8)is equal to

 11

The point of intersection of the straight lines 9x – y – 2 = 0 and 2x + y – 9 = 0 is