## Perpendicular lines

Algebra, Functions and equations, Circular functions and trigonometry, Vectors, Statistics and probability, Calculus. IB Maths SL Revision Notes

### Perpendicular lines

IB Mathematics SL, slope of a line, perpendicular & parallel lines

How can we find the slope of the line which is perpendicular to the line $y=4x+7$ ?

Thanks
Jane

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Joined: Tue Mar 19, 2013 8:47 pm

### Re: Perpendicular lines

IB Math SL, gradient of a line, perpendicular - parallel lines

If two lines are perpendicular their slopes are negative reciprocals and if two lines are parallel have equal slopes.
Regarding your question about the gradient of the line which is perpendicular to the line $y=4x+7$.

Let $m$ be the required slope then we have the following relation:

$m \cdot 4=-1 =>m=\frac{-1}{4}=- \frac{1}{4}$

Hope these help!
nicole

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Joined: Mon Jan 28, 2013 8:10 pm

### Re: Perpendicular lines

Thanks Nicole!
Jane

Posts: 0
Joined: Tue Mar 19, 2013 8:47 pm