
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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December 2nd, 2016, 07:13 PM  #1 
Newbie Joined: Dec 2016 From: Hong Kong Posts: 2 Thanks: 0  Maths（Help！😭）
How can I solve 10(b), 18(b), 23(b) and 24(b)?
Last edited by skipjack; December 2nd, 2016 at 07:36 PM. 
December 2nd, 2016, 07:42 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,967 Thanks: 1607 
The lines with equations ax + by + c = 0 and bx  ay + d = 0 are perpendicular.

December 2nd, 2016, 10:45 PM  #3 
Global Moderator Joined: Dec 2006 Posts: 18,967 Thanks: 1607 
In 23(b), what is the ycoordinate of B? In 24(b), what is the xcoordinate of B? 

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