mathematics

4x+6y=21
7x-3y=3

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  1. multiply the 2nd equation by 2 , and add the result to the 1st equation
    ...this will eliminate the x-term

    solve the resulting equation for y
    ... substitute back to find x

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  2. actually, if you follow step 1, you eliminate y. But then just use the x value obtained to find y.

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