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Monday, April 7, 2014

Finding Equation - Curve, 11

Category: Differential Equations, Integral Calculus, Analytic Geometry, Algebra

"Published in Newark, California, USA"

Find the equation of the curve for which y" = x, and which passes through the point (1, 2) with the slope of 5/2.

Solution:

The concavity of a curve is equal to the second derivative of a curve with respect to x. In this case, y" = d²y/ dx². Let's consider the given concavity of a curve



We can rewrite the above equation as follows



Multiply both sides of the equation by dx, we have



 
Integrate on both sides of the equation, we have




In order to get the value of arbitrary constant, substitute the value of the given point which is (1, 2) and the value of the given slope which is dy/dx = 5/2 to the above equation, we have   







Hence, the above equation becomes



Multiply both sides of the equation by dx, we have 




Integrate on both sides of the equation, we have






In order to get the value of arbitrary constant, substitute the value of the given point which is (1, 2) to the above equation, we have

   



Therefore, the equation of a curve is 




 

Sunday, April 6, 2014

Finding Equation - Curve, 10

Category: Differential Equations, Integral Calculus, Analytic Geometry, Algebra

"Published in Newark, California, USA"

Find the equation of a curve having the given slope that passes through the indicated point:


Solution:

The slope of a curve is equal to the first derivative of a curve with respect to x. In this case, y' = dy/dx. Let's consider the given slope of a curve



Multiply both sides of the equation by dx, we have 




Integrate on both sides of the equation, we have  










In order to get the value of arbitrary constant, substitute the value of the given point which is P(9, 9) to the above equation, we have    






Therefore, the equation of a curve is