My Math Forum Maths（Help！😭）

 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

December 2nd, 2016, 07:13 PM   #1
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Maths（Help！😭）

How can I solve 10(b), 18(b), 23(b) and 24(b)?
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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. Thanks from SLWKXOXO
 December 2nd, 2016, 10:45 PM #3 Global Moderator   Joined: Dec 2006 Posts: 18,967 Thanks: 1607 In 23(b), what is the y-coordinate of B? In 24(b), what is the x-coordinate of B?

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