There is a linear relationship between a person's age and blood pressure. Two measurements are given:

Age Blood Pressure
10 115

30 125

A.)Write the linear function that can be used to determine a person's blood pressure given his age, P(x), in slope intercept form. (Hint: First write the equation in point slope form.)

B.) Use the function to determine the blood pressure of a 28 year old person.

So far I have: m= 125-115/30-10= 1/2

P(x)=1/2x+115…. I don't think this is right though.

Question

There is a linear relationship between a person's age and blood pressure. Two measurements are given:

Age Blood Pressure 
10 115

30 125

A.)Write the linear function that can be used to determine a person's blood pressure given his age, P(x), in slope intercept form. (Hint: First write the equation in point slope form.)

B.) Use the function to determine the blood pressure of a 28 year old person.

So far I have: m= 125-115/30-10= 1/2

P(x)=1/2x+115…. I don't think this is right though.

mathmale · Answer

I'd suggest you choose one of the two points given and substitute its coordinates, along with the slope you've calculated, into the point-slope form of the equation of a straight line.  This is quite different from borrowing the y-comp. of one of the points and using it as the y-intercept (b).

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