Referring to Eq. (9.13), when the two charges are positive and equal (q 1 = q2 = q), we can rewrite the magnitude of the gravitational force as F = G 191 92 = G92 1 d2 d2 In order to get a linear graph from the data we recorded in Table 2, one must relate Eq. (9.17) to the general equation for a linear graph y = ax + b (9.18) Establish the relationship between Eqs. (9.17) and (9.18) (i.e. y =?; a = ?; x =?; and b =?)