Question: graph the equation $-4x-5y=40$
1. **State the problem:** We need to graph the linear equation $$-4x - 5y = 40$$.
2. **Rewrite the equation in slope-intercept form:** The slope-intercept form is $$y = mx + b$$, where $$m$$ is the slope and $$b$$ is the y-intercept.
3. **Isolate $$y$$:**
$$-4x - 5y = 40$$
Add $$4x$$ to both sides:
$$-5y = 4x + 40$$
Divide both sides by $$-5$$:
$$y = \frac{4x + 40}{-5} = \frac{4x}{-5} + \frac{40}{-5} = -\frac{4}{5}x - 8$$
4. **Identify slope and intercept:**
Slope $$m = -\frac{4}{5}$$
Y-intercept $$b = -8$$
5. **Find x-intercept:** Set $$y=0$$ and solve for $$x$$:
$$-4x - 5(0) = 40 \Rightarrow -4x = 40 \Rightarrow x = \frac{40}{-4} = -10$$
6. **Plot points:**
- Y-intercept at $$(0, -8)$$
- X-intercept at $$(-10, 0)$$
7. **Draw the line through these points:** This line represents the graph of the equation.
**Final answer:** The graph is a line with slope $$-\frac{4}{5}$$ passing through points $$(0, -8)$$ and $$(-10, 0)$$.