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{:[x+y=3],[x-3y=-9]:}
What is the solution 
(x,y) to the given system of equations?

x+y=3x3y=9 \begin{array}{c} x+y=3 \\ x-3 y=-9 \end{array} \newlineWhat is the solution (x,y) (x, y) to the given system of equations?

Full solution

Q. x+y=3x3y=9 \begin{array}{c} x+y=3 \\ x-3 y=-9 \end{array} \newlineWhat is the solution (x,y) (x, y) to the given system of equations?
  1. Write Equations: Write down the system of equations.\newlineWe have the following system of linear equations:\newline11) x+y=3x + y = 3\newline22) x3y=9x - 3y = -9\newlineWe will use the method of elimination or substitution to find the values of xx and yy.
  2. Choose Solution Method: Decide which method to use for solving the system.\newlineWe can use either elimination or substitution. For this example, let's use the substitution method since the first equation is already solved for xx in terms of yy.
  3. Solve for xx: Solve the first equation for xx.x=3yx = 3 - yNow we have an expression for xx that we can substitute into the second equation.
  4. Substitute xx: Substitute the expression for xx into the second equation.\newlineSubstitute x=3yx = 3 - y into x3y=9x - 3y = -9:\newline(3y)3y=9(3 - y) - 3y = -9
  5. Simplify and Solve for y: Simplify the equation and solve for y.\newline3y3y=93 - y - 3y = -9\newlineCombine like terms:\newline34y=93 - 4y = -9\newlineNow, subtract 33 from both sides:\newline4y=93-4y = -9 - 3\newline4y=12-4y = -12\newlineNow, divide both sides by 4-4 to solve for y:\newliney=124y = \frac{-12}{-4}\newliney=3y = 3
  6. Substitute yy into First Equation: Substitute the value of yy back into the first equation to solve for xx.\newlineNow that we know y=3y = 3, substitute it back into the first equation:\newlinex+3=3x + 3 = 3\newlineSubtract 33 from both sides to solve for xx:\newlinex=33x = 3 - 3\newlinex=0x = 0
  7. Find Solution: Write down the solution to the system of equations.\newlineThe solution to the system of equations is (x,y)=(0,3)(x, y) = (0, 3).