how to solve???
Which of the following is the equation of a line that passes through (-2, -1) and (-4, -3)?
A. y =1/2 x + 1
B. y = x + 1
C. y =1/2 x – 1
D. y = x – 1
m = (-3 - (-1)) / (-4 - (-2))
m = (-3 + 1) / (-4 + 2)
m = -2 / -2
m = 1
At this point, we know the answer is either B. or D.
y = mx + b
y - mx = b
b = -1 - 1(-2) Using the first point
b = -1 + 2
b = 1
Our equation is y = x + 1. That's B.