If y varies directly as x, y varies directly as x is 15
If y varies directly as x, this is expressed as:
[tex]y \ \alpha \ x \\y = kx[/tex]
k is the constant of proportionality
If y = 5 when x = 4
5 = 4k
k = 5/4
Next is to get the value of y when x = 12
Recall that y = kx
y = 5/4 * 12
y = 5 * 3
y = 15
Hence if y varies directly as x, y varies directly as x is 15
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