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30-10-2019
Mathematics

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Three times a number minus another number is -3. The sum of the numbers is 11. Find the numbers

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30-10-2019

The first equation is

[tex]3x-y=-3[/tex]

The second equation is

[tex]x+y=11[/tex]

If you sum the two equations you'll cancel y:

[tex]4x=8 \iff x=2[/tex]

And since the sum must be 11, we have y=9.

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