Question

Which is the equation of the line?

Answer 1

Y=-3x+9 is the answer.

Answer 2

The y-intercept (where the line passes the y-axis) is positive 9.

The line is decreasing so the slope is negative.

The slope of a line can be found by the equation :

y2 - y1 / x2 - x1

Substitute the coordinates.

0 - 9 / 3 - 0

-9 / 3

-3


The slope is -3.


So, your equation in slope - intercept form is :

y = -3x + 9