Question

The blue line of best fit for boys intersects the vertical axis at 55 centimeters and the point (12.5, 70). Which equation best describes the boy's line of best fit?

a = 2.4h + 85

h = 2.4a + 70

a = 1.2h + 70

h = 1.2a + 55

none of the above

Answer 1

Write the equation of the line in slope intercept form.
Given the points: (0, 55) and (12.5, 70)
slope = (70-55)/(12.5-0)
= 15/12.5
= 1.2

y-intercept, b = 55

equation is:
y = 1.2x + 55

** Graph has units of x-axis = a and y-axis = h So if you replace with correct variables...

h = 1.2a + 55