Answer:
D
Explanation:
y-intercept is when the line hits the y-axis, or when the x=0 on a line.
Look at the test below the axis.
y-axis = heartrate (resting)
for
x-axis = hrs of exercise per week
When x = 0, (0 hours of exercise,) y = 80, (average resting heart rate.)Telling us the average resting heartrate pf people who do not exercise.