Question

Find the equation of the line passing through the points (2,1) and (5, 10)

y = 3x + ?

Answer 1

y = 3x -5

Explanation:

y = mx + b

for (5, 10)

b = y - mx = 10 - 3 x 5 = - 5

y = 3x -5

for (2,1)

check: 1 = 2 x 3 -5