A-Level Edexcel Biology A2 Linear Relationships

A-Level Edexcel Biology A2 Linear Relationships
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Biology, Issue 2, February 2021Biology XBI11/YBI11

Review A-Level Edexcel Biology linear relationships through y=mx+c calculations, graph gradients, intercepts and biological predictions from straight-line data.

How this is tested

  • use y=mx+c to calculate biological values such as heart rate from linear data
  • write straight-line equations from biological graphs using gradient and intercept

Question 6(b)

[Maximum number: 3]

Exercise affects the cardiac output of a person.
The graph shows the change in heart rate following exercise for an unfit person and for a fit person.

Figure for Question 6(b) — Edexcel A-Level Biology A2

Calculate the heart rate of the unfit person at 5 minutes.

The change in heart rate of the unfit person is a linear relationship.
Use the equation for a straight line y=mx+c.