Answer:
k is constant of proportionality
Monday: k = 7.5
Tuesday: k = 2
Explanation:
The equation for proportionality is y = kx
Take the first line of the table, plug it in and solve for k. Do that with at least 1 other row to be sure k is the same.
15 = (k)(2)
k = 7.5
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Same thing for this day. x is the horizontal, y is the vertical.
16 = (k)(8)