Question
Question: If the line passing through (4, 3) and (2, k) is perpendicular to y = 2x + 3, then k =...
If the line passing through (4, 3) and (2, k) is perpendicular to y = 2x + 3, then k =
A
– 1
B
1
C
– 4
D
4
Answer
4
Explanation
Solution
slope of line passes through (4, 3) and (2, k)
m1 = 
slope of given line y = 2x + 3
m2 = 2
Now m1m2 = –1
Ž –
(2) = –1