Question

Write an equation of the line that passes through (1,5) and (-1, 3).
A) y = x + 9
B) y = x + 4
C) y = -x + 4
D) y = -x + 9

Answer 1

slope = dy/dx = 3 - 5/ -1 - 1 = -2/-2 = 1

y = mx + b ( m = 1)

y = x + b

3 = -1 + b
b = 4

y = x + 4

Answer 2

thanks