Find the equation of the line in slope-intercept form (y = mx+b)

m=-1 and b (9,4)

y = - x + 13

Step-by-step explanation:

The equation of a line in slope - intercept form is

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

Here m = - 1, thus

y = - x + b ← is the partial equation

To find b substitute (9, 4) into the partial equation

4 = - 9 + b ⇒ b = 4 + 9 = 13

y = - x + 13 ← equation of line