Question

Which of the following has a slope of -3 and a y-intercept of -4?

A. y = -3x + 4

B. y = 3x + 4

C. y = 3x - 4

D. y = -3x - 4

Answer 1

y = mx + b where m = slope and b = y-intercept 

slope of -3 and a y-intercept of -4

so
y = -3x - 4

answer
D. y = -3x - 4

Answer 2

Formula =
y = mx + c
m = slope @ gradient
c = y intercept

the equation based on the value given is
y = - 3x - 4

the answer is D