Question

Rewrite in a 7th graders response
A freelance photographer charges a $20
booking fee plus $15 for every hour of work. The x-axis measures hours, and each unit on the y-axis represents $5, so the
plotted line has equation y = 3x + 4 (in $5-
units), which corresponds to Total charge =
5(3x + 4) = $15x + $20. The slope 3 means
the cost increases by $15 each hour and the y-intercept 4 represents the $20 flat booking fee.

Answer 1

A freelance photographer charges a $20 booking fee plus $15 for every hour they work. On the graph, the x-axis is hours and each step up the y-axis is $5. That means the line is y = 3x + 4 when y is counted in $5-units (because 3 × $5 = $15 per hour and 4 × $5 = $20 booking fee). Converting back to dollars gives Total charge = 5(3x + 4) = $15x + $20. The slope 3 tells us the cost goes up by $15 for each extra hour, and the y-intercept 4 shows the $20 starting booking fee. For example, 2 hours costs $15·2 + $20 = $50.