Exercise 1 Page 281

Equations in slope-intercept follow a certain format. y=mx+ b The line has a slope of - 3 which means that we can substitute m=- 3. y=- 3x+ b To write a complete equation for this line, we also need to determine the y-intercept b. We can do that by substituting the given point (- 4,2) into the equation and solving for b.

Now that we have both the slope and y-intercept we can write the final equation. y=- 3x+( - 10) ⇔ y=- 3x - 10