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Solve the system of equations: 2x + y = 7 and 3x − 2y = 3. Then find how much 7x is greater than 10.

Mathematics

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Answer

7

Step-by-step solution

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

    Equation (1): 2x+y=72x + y = 7
    Equation (2): 3x−2y=33x - 2y = 3

  2. Solve the system of equations for xx and yy.

    We will use the elimination method. Multiply Equation (1) by 2 to make the coefficients of yy opposites.

    2×(2x+y)=2×72 \times (2x + y) = 2 \times 7 4x+2y=14(Equation 3)4x + 2y = 14 \quad \text{(Equation 3)}

    Now, add Equation (3) and Equation (2):

    (4x+2y)+(3x−2y)=14+3(4x + 2y) + (3x - 2y) = 14 + 3 4x+3x+2y−2y=174x + 3x + 2y - 2y = 17 7x=177x = 17

    Divide by 7 to find xx:

    x=177x = \frac{17}{7}

    Substitute the value of xx into Equation (1) to find yy:

    2(177)+y=72\left(\frac{17}{7}\right) + y = 7 347+y=7\frac{34}{7} + y = 7

    Subtract 347\frac{34}{7} from both sides:

    y=7−347y = 7 - \frac{34}{7} y=497−347y = \frac{49}{7} - \frac{34}{7} y=157y = \frac{15}{7}
  3. Calculate $7x$.

    We found x=177x = \frac{17}{7}.

    7x=7×1777x = 7 \times \frac{17}{7} 7x=177x = 17
  4. Determine how much $7x$ is greater than 10.

    To find how much 7x7x is greater than 10, we subtract 10 from 7x7x.

    7x−10=17−107x - 10 = 17 - 10 7x−10=77x - 10 = 7

    The value of 7x7x is greater than 10 by 7.

    The final answer is 7.

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