Question

If the straight line joining the points (3, 4) and (2,-1) be parallel to the line joining the points (a, -2) and (4, -a), find the value of a.​

Answer 1

Answer:

i dont know the answer to im sorry!

Answer 2

Answer:

OA = 21+j+4k, OB = (a-1)i+4j-k

So, AB = OBOA = (a-3)ī+3j-5k

Let OC = 2i+(b-1)

OD = 5i+3j-2k

CD=OD-OC = 5i+j+(-b−1)k

Given AB and CD are parallel.

AB = m CD

(a-3) 7+37-5k m(Si+j+(-b−1)k)

Equating vector(i,j,k) coefficient on both side

3-mm(-b-1) =-5 3(-6-1) =-5 ⇒-6-1

a - 3 = 5n x - 3 = 5(3) a - 3 = 15 a = 18 -b +1== -5+3

a= 18; b=