Question

Group 5

Story problem
Table
Rent-a-boat charges a service fee of $30 and
$10 per hour
ya mx +b
OR
y = kx
Graph
Equation:
m (slope) or k(slope):
y-intercept:

Answer 1

• y = 10x + 30
• see below for a graph

Explanation:

We assume you want an equation for total charges (y) as a function of number of hours rental (x). The charges go up $10 for each hour, so the slope (m or k) is 10 ($ per hour). The initial charge, even for zero hours, is 30 (dollars), so the total charges (in dollars) are ...

y = 10x +30

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The graph has its y-intercept at 30, and has a slope of 10. (In the attached, the vertical scale is different than the horizontal scale so a reasonable amount of the graph fits on the page.)