Question

Find the equation of the line that passes through points A and B.
(A (4, 7)
B (2, 3)

Answer 1

Answer: y = 2x -1

Explanation:

y/x =

(7-3)/(4-2) =

4 / 2 =

2

y= ax + b. With a = 2 so...

y = 2x + b

This goes through (4,7) and (2,3)

7 = (2 x 4) + b

7 = 8 + b

-1 = b

Or

3 = (2 x 2) + b

3 = 4 + b

-1 = b