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?

Y = 1.2X + 55

Step-by-step explanation:

As the blue line is a straight line, so that the equation describing it has the following form:

Y = a.X + b (1)

As the blue line intersects the vertical axis at 55 cm, so that it crosses point A with . As point A is on the blue line, so that:

+)

=> 55 = a.0 + b

=> 55 = b

As the blue line intersects the pink line at point B(12.5; 70) so that . As point B is on the blue line, so we have:

+)

=> 70 = a*12.5 + b

As b = 55

=> 70 = 12.5*a + 55

=> 12.5* a = 70 - 55 = 15

=> a = 15/12.5 = 1.2

Replace a = 1.2 and b = 55 into equation (1), we have:

Y = 1.2X + 55

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