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December 2nd, 2016, 08:13 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 08:36 PM.
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December 2nd, 2016, 08:42 PM   #2
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The lines with equations ax + by + c = 0 and bx - ay + d = 0 are perpendicular.
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December 2nd, 2016, 11:45 PM   #3
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In 23(b), what is the y-coordinate of B?

In 24(b), what is the x-coordinate of B?
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