Question

If u varies directly with v, with k=0.6, what is the value of u when v=7.8?

a. u = 13
b. u = 0.77
c. u = 0.468
d. u = 4.68

Answer 1

`\bf \qquad \qquad \textit{direct proportional variation} \\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad \stackrel{\textit{constant of variation}}{y=\stackrel{\downarrow }{k}x~\hfill } \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \stackrel{\textit{`