Write an equation in slope-intercept form of the line through point P(6, –1) with slope 4.

Question

A. y = 4x – 25
B. y + 6 = 4(x – 1)
C. y + 1 = 4(x – 6)
D. y = 4x – 1

How would I do this?

Answer 1

first, review the point-slope form. It relies on the fact that the slope of a line is constant. So, the slope between any two points is always the same. So, pick any point (x,y) on the line and use the definition of the slope to see that

(y-(-1))/(x-6) = 4

Or, more usually it is written

y+1 = 4(x-6)

Answer 2

I go that, but it was graded as wrong! :( which is why I'm confused

Answer 3

maybe it is B?

Answer 4

It's A. y = 4x – 25