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Solve the system of linear equations: 2x + 2y = 10 and 3x − y = 3.

Mathematics

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Answer

x=2x = 2

y=3y = 3

Step-by-step solution

4 steps
  1. Write down the given system of equations.

    We have the following system:

    2x+2y=10(1)2x + 2y = 10 \quad (1) 3x−y=3(2)3x - y = 3 \quad (2)
  2. Multiply equation (2) by 2 to make the coefficients of yy opposites.

    Multiplying equation (2) by 2 gives:

    2(3x−y)=2(3)2(3x - y) = 2(3) 6x−2y=6(3)6x - 2y = 6 \quad (3)
  3. Add equation (1) and equation (3) to eliminate yy and solve for xx.

    (2x+2y)+(6x−2y)=10+6(2x + 2y) + (6x - 2y) = 10 + 6 2x+6x+2y−2y=162x + 6x + 2y - 2y = 16 8x=168x = 16

    Divide both sides by 8:

    8x8=168\frac{8x}{8} = \frac{16}{8} x=2x = 2
  4. Substitute the value of xx into one of the original equations to solve for yy.

    Using equation (2):

    3x−y=33x - y = 3

    Substitute x=2x = 2:

    3(2)−y=33(2) - y = 3 6−y=36 - y = 3

    Subtract 6 from both sides:

    −y=3−6-y = 3 - 6 −y=−3-y = -3

    Multiply both sides by -1:

    y=3y = 3

    The solution to the system of equations is:

    x=2x = \boxed{2} y=3y = \boxed{3}
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