Question

Write an equation for the line describcd. Give your answer in slope -intercept form. m-9, through (-9,2)

Answer 1

Equations

With the slope (m) and a point, let's write our equation.

y = mx + c

y = -9x + c

Now substitute the coordinates of the point.

2 = -9(-9) + c

2 = 81 + c

2 - 81 = c

-79 = c

The equation is calculated as: y = 9x -79.

Answer 2

y = - 9x - 79

Explanation:

the equation of a line in slope- intercept form is

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

here m = - 9 , then

y = - 9x + c ← is the partial equation

to find c substitute (- 9, 2 ) into the partial equation

2 = - 9(- 9) + c = 81 + c ( subtract 81 from both sides )

- 79 = c

y = - 9x - 79 ← equation of line