Q. dxdy=3y, and y=2 when x=1.Solve the equation.Choose 1 answer:(A) y=e3x−6(B) y=2e3x−3(C) y=2e3x+3(D) y=2e3x+1
Recognize First-Order Linear Homogeneous: Recognize that the given differential equation is a first-order linear homogeneous differential equation which can be solved using separation of variables.
Separate Variables and Integrate: Separate the variables by dividing both sides by y and multiplying both sides by dx to get y1dy = 3dx.
Solve for Constant C: Integrate both sides of the equation. The integral of (1/y)dy is ln∣y∣, and the integral of 3dx is 3x.∫(1/y)dy=∫3dxln∣y∣=3x+C, where C is the constant of integration.
Substitute and Find Particular Solution: Solve for the constant C using the initial condition y=2 when x=1.ln∣2∣=3(1)+Cln(2)=3+CC=ln(2)−3
Exponentiate to Solve for y: Substitute the value of C back into the equation ln∣y∣=3x+C to get the particular solution.ln∣y∣=3x+ln(2)−3
Simplify the Equation: Exponentiate both sides to solve for y.eln∣y∣=e3x+ln(2)−3y=e3x⋅eln(2)−3
Simplify the Equation: Exponentiate both sides to solve for y.eln∣y∣=e3x+ln(2)−3y=e3x⋅eln(2)−3Simplify the equation using properties of exponents.y=e3x⋅(e3eln(2))y=e3x⋅(e32)y=2e3x−3
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