Find the value of y, if the line joining (3, y) and (2,7) is parallel

1.	Find the value of y, if the line joining (3, y) and (2,7) is parallel to the line joining thepoints (-1,4) and (0,6). (March-2014 SAQ) (Mar-08, TS-Mar-17)58.
Answer» let A = ( 3 , y) & B = ( 2 , 7 ) C = ( 1 , -4 ) & D = ( 0 , 6 ) so, slope of AB = slope of CD { as the point are parallel } (7 - y) / ( 2-3) = (6 + 4) / (0 - 1) {slope = (y2 - y1) / (x2 - x1) } (7 - y) / (-1) = (10) / (-1) 7 - y = 10 - y = 10 - 7 y = -3 Sorry I think answer is y=9

Find the value of y, if the line joining (3, y) and (2,7) is parallel to the line joining thepoints (-1,4) and (0,6). (March-2014 SAQ) (Mar-08, TS-Mar-17)58.

Answer»

let A = ( 3 , y) & B = ( 2 , 7 )

C = ( 1 , -4 ) & D = ( 0 , 6 )

so,

slope of AB = slope of CD { as the point are parallel }

(7 - y) / ( 2-3) = (6 + 4) / (0 - 1) {slope = (y2 - y1) / (x2 - x1) }

(7 - y) / (-1) = (10) / (-1)

7 - y = 10

- y = 10 - 7

y = -3

Sorry I think answer is y=9