10365176
Description
Mind Map by Tom Woollin, updated more than 1 year ago
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Created by Tom Woollin
over 7 years ago
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Direct and inverse
proportion
- Direct proportion
- The equation: y=k*x
- Example
- If Y is directly
proportional to X,
when X = 12 and =
3. Find the value of
X when Y = 8
- First, find the constant of
proportionality, K. First write
the equation-X(pretend
there is a direct proportion
symbol here)Y. Then turn
this into the equation -
Y=K*X.
- Now we need to find K, since
we know that X=12 and Y=3,
we can rewrite the equation
as 3=k*12, then rearrange it to
k=3/12. So we know that
k=0.25.
- So we have the complete
equation now - Y=0.25*X. All
we need to do now is put the
numbers in. 8=0.25*X. We can
rearrange this to be X=8/0.25
- When Y=8, X=32
- When Y=8, X=32
- So we have the complete
equation now - Y=0.25*X. All
we need to do now is put the
numbers in. 8=0.25*X. We can
rearrange this to be X=8/0.25
- Now we need to find K, since
we know that X=12 and Y=3,
we can rewrite the equation
as 3=k*12, then rearrange it to
k=3/12. So we know that
k=0.25.
- First, find the constant of
proportionality, K. First write
the equation-X(pretend
there is a direct proportion
symbol here)Y. Then turn
this into the equation -
Y=K*X.
- If Y is directly
proportional to X,
when X = 12 and =
3. Find the value of
X when Y = 8
- The equation: y=k*x
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