a linear equation is an equation that may additionally be put in the structure where are the variables, and are the coefficients, which are often real numbers. The coefficients may also be considered as parameters of the equation, and may also be arbitrary expressions, furnished they do no longer include any of the variables.
T represents hours, so if c(1.5)=c(t) as it mentioned in the problem, then 1.5 equals hours, and c represents cost, so if cost + time equals nine then I think it's a
