Since the value of y is directly proportional to the value of x, when x = 15, y is equal to 90.
Given the following data:
To find the value of y when x = 15:
Since the value of y varies directly with the value of x. This ultimately implies that, the value of y is directly proportional to the value of x.
Mathematically, this is represented as follows:
[tex]y\;\alpha \;x\\\\y=kx[/tex]
First of all, we would determine the constant of proportionality (k).
Substituting the given parameters into the formula, we have;
[tex]30=k5\\\\k=\frac{30}{5}[/tex]
k = 6
Now, we can solve for y when x = 15:
[tex]y =kx\\\\y=6\times 15[/tex]
y = 90
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