To put the equation 2x + 4y = -20 into slope-intercept form, we need to rearrange the terms in the equation so that the y-term is on the left-hand side and the constant term is on the right-hand side. We can do this by subtracting 2x from both sides of the equation:
4y = -20 - 2x
Then, we can divide both sides of the equation by 4 to find the slope:
y = -5 - (1/2)x
This is the slope-intercept form of the equation, where the slope is -5/2 and the y-intercept is -5. The slope-intercept form of the equation is:
y = -5/2x - 5
Simplifying the fraction gives us the final form of the equation:
y = -5/2x - 5
= -2.5x - 5