MYTUTOR SUBJECT ANSWERS

672 views

How can I tell if two lines are perpendicular from the equations?

In order to compare two equations they need to be in the same form. This means that the y's have to be on the left, and the x's have to be on the right - so the first step is to rearrange both of the equations that you are comparing to be in this form: y = mx + c where m is a number, and c is a number.

When we are talking about perpendicular lines, we really don't care about the c value as all this does is move the lines upwards and downwards along the y axis - what is important is m, the gradient value. Because we have two equations, we have two values of m to look at: m1, and m2. If the lines are perpendicular, then m1 will be the negative reciprocal of m2 - what does that mean?! Simply, that m1 = -1/m2. - Or even more simply, that if we multiply m1 by m2, the answer will be -1. 

In summary: rearrange, and then multiply the m values to check if the answer is -1.

Ben S. GCSE Maths tutor, GCSE Science tutor, GCSE Physics tutor

2 years ago

Answered by Ben, who has applied to tutor GCSE Maths with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

644 SUBJECT SPECIALISTS

£30 /hr

Helen M.

Degree: Law (Bachelors) - Durham University

Subjects offered:Maths, Business Studies+ 2 more

Maths
Business Studies
.LNAT.
-Personal Statements-

“Durham law graduate with four years tutoring experience in a wide range of subjects. ”

£22 /hr

Hinsum W.

Degree: Medicine (Bachelors) - Edinburgh University

Subjects offered:Maths, Chemistry+ 3 more

Maths
Chemistry
Biology
-Personal Statements-
-Medical School Preparation-

“Hi, I'm a first year medic at Edinburgh. I've had 7 years' worth of experience teaching children Maths and English and have mentored lower school peers, so I'm bound to have an approach that will suit your learning style!”

£30 /hr

Vicky H.

Degree: Dentistry (Masters) - Leeds University

Subjects offered:Maths, Science+ 12 more

Maths
Science
Mandarin
Human Biology
English Literature
English Language
Chemistry
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Oxbridge Preparation-
-Medical School Preparation-

“Hi I'm Vicky, I'm a 2nd year dental student at the University of Leeds. I am friendly and patient and have a love for science, maths and teaching.”

About the author

£18 /hr

Ben S.

Degree: Mechatronic Engineering (Masters) - Manchester University

Subjects offered:Maths, Science+ 1 more

Maths
Science
Physics

“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

MyTutor guarantee

You may also like...

Other GCSE Maths questions

(2x + 3)/(x-4) - (2x - 8)/(2x + 1) = 1

Why is it that when I am asked to factorise 3x^2-13x-10, I am not able to cancel two of the x's so that the answer is 3x-13-10?

Expand and simplify (5x – 2y)(3x – 4y)

Find the solutions of the equation x^2 - 2x - 8 =0

View GCSE Maths tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok