What is the equation in point-slope form of the line passing through (−1, 3) and (1, 7)? (5 points)

a. y − 7 = 4(x − 1)
b. y − 7 = 2(x − 1)
c. y − 3 = 2(x − 1)
d. y − 3 = 4(x + 1)