Answer:
$1.50 and 4.5 miles
Step-by-step explanation:
The constant of proportionality is basically just the slope of a line on a graph
Slope can be found by:
[tex]\frac {y_{2} - y_{1}} {x_{2} - x_{1}}[/tex]
10.50 - 7.50 = 3
7 - 5 = 2
3/2 = 1.50 = $1.50
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135 miles / 30 days = 4.5 miles per day
