Final answer:
The equation in slope-intercept form for the total umpts after x months is y = 7x.
Step-by-step explanation:
To write an equation in slope-intercept form for the total umpts after x months, we need to determine the initial value or y-intercept and the rate of change or slope. In this case, Farmer Lirn starts without any umpts, so the initial value is 0. Every month, he adds 7 more umpts, so the rate of change is 7. Therefore, the equation is y = 7x.
Learn more about Equations in slope-intercept form