anonymous
  • anonymous
If 3x + 4y=7 and 2x-3y=67 then which of the following is the value of xy?
Mathematics
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anonymous
  • anonymous
If 3x + 4y=7 and 2x-3y=67 then which of the following is the value of xy?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
If xy is the product of x and y then, then multiply the x and y solution of the simultaneous equations in the problem statement. x y = 17*-11 = -187
anonymous
  • anonymous
HOW DID YOU GET 17?=)
anonymous
  • anonymous
The solution for x and y in solving the equations\[\{3x+4y\text{=}7, 2x-3y\text{=}67\}\]is 17 and -11 respectively. If the x and y values are plugged back into the equations\[\{3x+4y\text{=}7, 2x-3y\text{=}67\}\text{/.}\{\{x\to 17,y\to -11\}\}\]The Mathematica result is\[\{\{\text{True},\text{True}\}\} \]meaning that the LHS is equal to the RHs for each equation respectively.

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