Which equation is in slope-intercept form and represents a line with slope 3 through the point (9, –4)? y=3x+21y=3x-31-3x+y=-31-3x+y=21

The slope-intercept form of a line is:



Where m is the slope and y is the y-intercept:



To find q (y-intercept), substitute the coordinates of the point (9, -4) in the equation of the line and solve it as an equation:

-4=3(9)+q
-4=27+q
q=-27-4=-31

The equation of the line is: y=3x-31

Where’s the