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Posted by U15491043 (U15491043) on Monday, 5th November 2012
hi , i know if a graph is y=2f(x) means that you multiply 2 by the y coordinate and y=f(2x) means you divide the x coordinate by 2, but what confuses me is fractions. for example what would y=f(1/2x) do to the point (6,12)
Posted by Maths Teacher BBC (U15178780) on Wednesday, 7th November 2012
If you know y=2f(x) means that you multiply 2 by the y coordinate
y=f(2x) means you divide the x coordinate by 2
treat fractions the exact same way.
y=f(1/2x) is inside the bracket so that would mean you divide the x coordinate by a half this time.
So in (6,12), x coordinate = 6 so now divide this by ½ = 6 / ½ = 12.
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