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Sagot :
So, the required value [tex]x[/tex] is 3.
Proportional:
Properly related in size, degree, or other measurable characteristics; corresponding: Punishment ought to be proportional to the crime. 3. Mathematics Having the same or a constant ratio.
The first part is y varies directly with x then,
[tex]y \propto x\\y=kx[/tex]... (1) where k is proportional constant
Now, substituting [tex]y=12, x=9[/tex] in equation (1) we get,
[tex]12=9k\\k=\frac{4}{3}[/tex]
Substituting [tex]k=\frac{4}{3}[/tex] in equation (1) with [tex]y=4[/tex] then,
[tex]4=(\frac{4}{3})x\\ x=3[/tex]
Learn more about the topic Proportional:
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