In: Math
A straight line is fit to a data set (ln x, y). This line intercepts the abscissa at ln x = 0.1 and has a slope of −0.02. What is the value of y at x = 5 from the fit?
Since the figure will be straight line having intercept 0.1 at abscissa and slope = - 0.02
Hence, equation of line
⇒ y = - m(ln x) + c
when x = 0.1, then y = 0
⇒ 0 = - 0.02(0.1) + c
⇒ c = 0.02
Now when x = 5
⇒ y = - m(ln 5) + c
⇒ y = - 0.02(1.6) + 0.02
⇒ y = - 0.032 + 0.02
⇒ y = - 0.030
∴ The value of y when x = 5 is -0.030.