Find the equation of a line with slope –4 and passing through the point (4, 5).
- x + y = 9
- x + 4y = 11
- 4x + y = 21
- 3x + 2y = 10
- 5x + y = 30
The Usual Method
Using the point slope form of equation of a straight line, we get:
Estimated Time to arrive at the answer = 30 seconds.
We already know the slope intercept form as y = mx + c.
The slope here is given as –4.
Thus, y = –4x + c or 4x + y = c
Thus, the coefficient of x should be 4.
Only option ‘3’ satisfies this condition and hence it is the answer.
Estimated Time to arrive at the answer = 5 seconds.