Question

Use function notation to write the equation of the line


f (x) = 1/2x − 1
f (x) = −2x − 1
f (x) = 2x − 1
f (x) = −2x + 1

Answer 1

I will use points (0,-1) and (-2,3)

Answer 2

(y2-y1)/(x2-x1) = m

(3-(-1) / (-2-0) = m = -2

Answer 3

point-slope form: y-y1=m(x-x1)

I will use the point (-2,3)

y-3=-2(x-(-2))
y-3=-2x-4
+3 +3

y=-2x-1