To find the value of \( y \) using the equation of the line of best fit \( y = 5.5x + 16 \), we need to substitute the age (given as \( x = 8 \)) into the equation.
Using the equation: \[ y = 5.5(8) + 16 \] Calculating it step-by-step: \[ y = 44 + 16 = 60 \]
Therefore, the value for \( y \) when \( x = 8 \) is 60.
Now, given the table shows weights as potential options (60, 59, 68, 70), the correct answer is 60.