Question

Which equation has its graph a line perpendicular to the graph of the line that passes through the points(0,-1) and (8,9)
(y-2) = -4/5(x+1)
y = 4/5x + 10
4x - 5y = 0
y = -x + 7

Answer 1

Okay, I can help you with this problem. What do you know about the slope of a line?

Answer 2

rise/run
or the change of the y-axis/change of the x-axis

Answer 3

Correct

Answer 4

Now, if you are given two points on a line, how can you calculate the slope?

Answer 5

for example, what is the slope between the two points (0,0) and (1,1)?

Answer 6

1-0/1-0
1/1