Question

What is the slope-intercept equation of the line below?

Answer 1

C

Explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, - 1) and (x₂, y₂ ) = (- 1, 1)

m =
`(1+1)/(-1-0)` =
`(2)/(-1)` = - 2

Note the line crosses the y- axis at (0, - 1) ⇒ c = - 1

y = - 2x - 1 → C