SOLUTION: David does landscaping for private homes and businesses. He charges $40.00 to travel to the site and then $40.00 per hour for his services. The equation y = 40 + 40x models the c

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Question 574324: David does landscaping for private homes and businesses. He charges $40.00 to travel to the site and then $40.00 per hour for his services. The equation y = 40 + 40x models the charge for his services y for any number of hours x.
a. Graph the equation. Describe your graph.
b. What is the slope of the line? What does the slope represent?
c. What is the y-intercept of the line? What does the y-intercept represent?
d. Julia paid David $240.00 for his services. How many hours did David work?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+y+=+40+%2B+40x+
(a) +graph%28+400%2C+400%2C+-2%2C+10+%2C+-50%2C+300%2C+40+%2B+40x%29+
(b) The slope is the rate he charges, $40/hr
The slope is +40%2F1+ dollars/days
(c) The y-intercept is where +x+=+0+, or where
there is no time charged, just the $40 for travel
(d) +240+=+40+%2B+40x+
Subtract +40+ from both sides
+40x+=+200+
+x+=+5+
David worked 5 hrs