FPM(2023) January Paper 01 que 9 and solution

Solution

We are given the system of equations:

$$ e^{2y} - x + 2 = 0 \tag{1} $$

$$ \ln(x + 3) - 2y - 1 = 0 \tag{2} $$

Step 1: Solve equation (1) for $x$

From equation (1):

$$ e^{2y} - x + 2 = 0 $$

Rearranging for $x$:

$$ x = e^{2y} + 2 \tag{3} $$

Step 2: Substitute equation (3) into equation (2)

Substitute the expression for $x$ from equation (3) into equation (2):

$$ \ln(e^{2y} + 5) - 2y - 1 = 0 $$

Simplifying:

$$ \ln(e^{2y} + 5) = 2y + 1 $$

$$ e^{2y} + 5 = e^{2y + 1} = e^{2y}e $$

$$ e^{2y}(e - 1) = 5 \tag{4} $$

Step 3: Solve equation (4) numerically

Numerically solving equation (4) gives:

$$ 2y = \ln\left(\frac{5}{e - 1}\right) \rightarrow y \approx 0.53 $$

Step 4: Solve for $x$

Substitute the value of $y$ into equation (3):

$$ x = e^{2(0.53)} + 2 \approx 4.91 $$

Thus, the solutions are:

$$ x \approx 4.91, \quad y \approx 0.53 $$

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