+0  
 
+1
43
2
avatar+910 

 

A bit stuck here, any help?

Julius  May 2, 2018
Sort: 

2+0 Answers

 #1
avatar+86528 
+2

Remember that    a(x1, y1)   - b(x2, y2 ) =   ( ax1 - bx2, ay1  - by2 )

 

a(3,4)  - b(2,4)   =  (8,10)

 

So we have that

 

3a  - 2b  = 8      and

4a  - 4b  = 10

 

Multiply the first equation by - 2  all the way through

 

-6a  + 4b  =  -16     

4a  -   4b   =  10        add these

 

-2a   =  -6     divide both sides by  -2

a  = 3

 

And using   3a  - 2b  = 8  to  find b, we have that

 

3(3)  - 2b  = 8

9  - 2b  = 8 

-2b  = -1

b  = 1/2

 

 

cool cool cool

CPhill  May 2, 2018
edited by CPhill  May 2, 2018
 #2
avatar+1350 
+5

b = 1/2

IAmJeff  May 2, 2018

26 Online Users

New Privacy Policy (May 2018)
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  Privacy Policy