Question

What is the equation in point-slope form of the line passing through (–2, 0) and (2, 8)?

a. y = 2(x + 2)

b.y = 2(x – 2)

c. y = –2(x – 2)

d.y = –2(x + 2)

Answer 1

First find the slope:
y2-y1 / x2-x1
8 - 0 / 2 -(-2)
8/4
2/1

so slope/m = 2

Point slope form:
y - y1 = m(x-1)
y - 0 = 2(x-1)
y = 2(x - 1)

Answer 2

i dont get it is not in one of the answers

Answer 3

Whoops sorry! I meant
y - y1 = m(x -(-2))
y - 0 = 2(x+2)
y = 2(x + 2)

Answer 4

the slope means the gradient
the equation for the gradient is



m=gradient
y2=second y coordinate
y1=first y coordinate
x2=second x coordinate
x1=first x coordinate


sub in

Answer 5

equation of a line has an equation



y1= y coordinate
x1 = x coordinate

(you can use any set of coordinates just make sure the coordinate you use y from you also use x)