Q. y(1)=1x′(t)=3y′(t)=2tWrite the equation of the line tangent to the curve given by x(t)=3t−1 and y(t)=t2 at the point where t=1.
Find Slope of Tangent: To find the equation of the tangent line, we need to determine the slope of the tangent line at the point where t=1. The slope of the tangent line is given by the derivative of y with respect to x, which can be found using the derivatives of y with respect to t and x with respect to t.
Derivative of x: First, we find the derivative of x with respect to t, denoted as x′(t). Given x(t)=3t−1, we differentiate with respect to t to get x′(t)=3.
Derivative of y: Next, we find the derivative of y with respect to t, denoted as y′(t). Given y(t)=t2, we differentiate with respect to t to get y′(t)=2t.
Evaluate Derivatives at t=1: Now, we evaluate both derivatives at t=1. For x′(1), we have x′(1)=3. For y′(1), we have y′(1)=2×1=2.
Calculate Tangent Line Slope: The slope of the tangent line at t=1 is the ratio of the derivatives, which is x′(1)y′(1)=32.
Find Coordinates at t=1: We also need the coordinates of the point on the curve at t=1. We substitute t=1 into the original equations to find the coordinates. For x(1), we have x(1)=3×1−1=2. For y(1), we have y(1)=(1)2=1.
Use Point-Slope Form: With the slope of the tangent line and the point of tangency, we can use the point-slope form of the equation of a line: y−y1=m(x−x1), where m is the slope and (x1,y1) is the point of tangency.
Substitute Slope and Point: Substituting the slope and the point into the point-slope form, we get y−1=(32)(x−2).
Convert to Slope-Intercept Form: To write the equation in slope-intercept form, we can distribute the slope and simplify: y−1=(32)x−(34).
Solve for y: Finally, we add 1 to both sides to solve for y: y=(32)x−(34)+1.
Final Tangent Line Equation: Simplifying the equation, we combine like terms: y=32x−34+33.
Final Tangent Line Equation: Simplifying the equation, we combine like terms: y=32x−34+33.The final equation of the tangent line is y=32x−31.
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