maths exam question

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usernamenew
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#1
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#1
hi the question is
w is directly proportional to y
w in inversely proportional to x squared
when y=4 w=14
work out w when y=9.
I worked out that k=3.5. is that right?
what do I do next?
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mysticmagic2000
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#2
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#2
(Original post by usernamenew)
hi the question is
w is directly proportional to y
w in inversely proportional to x squared
when y=4 w=14
work out w when y=9.
I worked out that k=3.5. is that right?
what do I do next?
w is directional proportional to y
so w=ky
sub y = 4 and w=14
k = 3.5
then put it back into the equation
w=3.5y

Hope I helped
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usernamenew
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#3
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#3
(Original post by mysticmagic2000)
w is directional proportional to y
so w=ky
sub y = 4 and w=14
k = 3.5
then put it back into the equation
w=3.5y

Hope I helped
thank you, do i put it in the direct proortional equation or the inversely one?
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mysticmagic2000
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(Original post by usernamenew)
thank you, do i put it in the direct proortional equation or the inversely one?
You put it in the directly proportional as the inversely one has an extra term which you haven't been given a value to!
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usernamenew
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#5
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(Original post by mysticmagic2000)
You put it in the directly proportional as the inversely one has an extra term which you haven't been given a value to!
thank you! can i also ask you about another question im confused on.
for the question, i thought you had to make the whole algebraic equation= 120 not 88? why do you have to subract 32 from 120?
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mysticmagic2000
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#6
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(Original post by usernamenew)
thank you! can i also ask you about another question im confused on.
for the question, i thought you had to make the whole algebraic equation= 120 not 88? why do you have to subract 32 from 120?
Hi again!

32 is not included in the two circles and although it is in the universal set, you do not include it your equation and therefore subtract it away from 120
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usernamenew
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#7
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(Original post by mysticmagic2000)
Hi again!

32 is not included in the two circles and although it is in the universal set, you do not include it your equation and therefore subtract it away from 120
hiya, thank you!
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