Question

Given that R is directly proportional to S and that R =141 when S = 5, find the constant of proportional and calculate the value of x when R =70?

Answer 1

`S=350/141`

Explanation:

`"Given "RpropS`

`"to convert to an equation multiply by k the constant"`
`"of variation"`

`R=kS`

`"to find k use the given condition"`

`R=141" when "S=5`

`R-kSrArrk=R/S=141/5`

`"equation is "R=(141S)/5`

`"when "R=70" then"`

`S=(5R)/141=(5xx70)/141=350/141`