Question

unit 7
unit rates & proportions
lesson 7
graphs of proportional relationships
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what is the average number of heartbeats per second?

Explanation:

Step1: Find the unit rate

The graph passes through the point \((4,6)\). The unit rate \(k\) (heartbeats per second) is found using the formula \(k=\frac{y}{x}\).
For the point \((x = 4,y = 6)\), we have \(k=\frac{6}{4}\).

Step2: Simplify the fraction

Simplify \(\frac{6}{4}\) by dividing both the numerator and the denominator by their greatest - common divisor, which is 2.
\(\frac{6\div2}{4\div2}=\frac{3}{2}=1.5\)

Answer:

\(1.5\)