-
What is the equation of a line perpendicular to the line x – 7y + 5 = 0 and having x-intercept 3?
-
- x + 7y = 21
- 7x + y = 21
- x + 2y = 10
- –x + y = 15
Correct Option: B
Let the slope of line be m Here,
| m1 = | = | ||
| - 7 | 7 |
As lines are perpendicular,
∴ m1 × m2 = –1
| m × | = - 1 | |
| 7 |
m = –7
∴ Equation of line is (y – y1) = m(x – x1) (y – 0)
= –7(x – 3) y = –7x + 21
⇒ 7x + y = 21
