more geometry help?

Question

write an equation in slope intercept form for each line:

line with slope -3 containing (0, 2.5)

Line through (1, 5) and (3, 11)

Answer 1

1. y = -3x + 2.5

2. slope = change in y / change in x
slope = 6/2
slope = 3
y = 3x + 2