The value of x when y is equal to 45 is 21.
Given the following data:
To determine the value of x when y = 45:
Translating the word sentence into a mathematical expression:
[tex]y\;\alpha \;x\\\\y = kx[/tex]
First of all, we would find the value of k.
[tex]k =\frac{y}{x} \\\\k =\frac{15}{7}[/tex]
Now, we can solve for x:
[tex]45 = \frac{15}{7} x\\\\315 =15x\\\\x=\frac{315}{15}[/tex]
x = 21
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