B. Express each of the following by means of an equation where k represents the constant of variation.
Write it on the space provided. (2 points each)
_7. The cost c varies directly as the number n of pencils.
8. The speed r of a moving objects is inversely proportional to the time t travelled.
9. If s varies directly as t and inversely as v.
10. The number of hours h required to finish a job varies inversely as the numbers of workers won
the job.