Diketahui matriks A=[x+y x y x-y], B=[1 -1/2x -2y 3], dan A^T=B dengan AT menyatakan transpose da...

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24 Dec 202302:06

Summary

TLDRThe script discusses solving a matrix equation by transposing known values. It explains how to rearrange matrix elements and solve for variables x and y using equations x+y=1 and x-y=3. The process involves elimination to find y=-1, then substituting back to find x=2. Finally, it calculates x+2y, resulting in 0, concluding the solution.

Takeaways

  • 📝 A transpose is equivalent to matrix B in the given problem.
  • 🔄 Transposing matrix A involves changing rows into columns or vice versa.
  • 🧼 The problem begins by converting A transpose: first row becomes a column.
  • ➕ Equation 1: x + y is given, with x turned into a column form.
  • ✖ Equation 2: x - y equals 3, which is another equation to solve.
  • ⚙ Solving the system of equations by substitution: x = -2y.
  • ➗ By elimination, 2y equals 1, solving for y gives y = -1.
  • 🔱 Substituting y back gives x = 2 from the equation x = -2y.
  • ➖ Finally, x + 2y is calculated as 2 + 2*(-1), which equals 0.
  • ✅ The answer to the problem is option C: 0.

Q & A

  • What is the first step in solving the problem involving matrix A and B?

    -The first step is to transpose matrix A by converting a row into a column, or vice versa, based on the provided values of A.

  • How do you transpose matrix A in the given example?

    -Matrix A is transposed by changing the row [x, y] into a column, where x is placed in the first row and y in the second row.

  • What equation do we derive from comparing A transpose with matrix B?

    -From comparing A transpose with matrix B, we derive the equation x = -2y.

  • What are the two main equations used for solving this problem?

    -The two main equations are x + y = 1 and x - y = 3.

  • How is the elimination method applied to solve the system of equations?

    -The elimination method is applied by subtracting x - y = 3 from x + y = 1, which eliminates x and gives 2y = -2, solving for y.

  • What is the value of y after solving the equation?

    -The value of y is -1.

  • How is the value of x determined after finding y?

    -The value of x is determined by substituting y = -1 into the equation x = -2y, resulting in x = 2.

  • What is the expression for x + 2y, and how is it calculated?

    -The expression for x + 2y is calculated as 2 + 2(-1) = 2 - 2 = 0.

  • What is the final answer to the problem?

    -The final answer to the problem is 0, which corresponds to option C.

  • How is the elimination method useful in this type of problem?

    -The elimination method simplifies solving systems of equations by removing one variable, making it easier to solve for the other variable.

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