The number that will be added to both side is the square of half the coeficient of x. i.e.
Solve for elimination 5x+3y=12 and x-4y=7
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The correct answer is 
You can find this by first starting with the original question.
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Now to solve a division problem with fractions, you can always flip the second one and turn it into multiplying.
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Now we can multiply numerator by numerator and denominator by denominator.
Then of course, we need to simplify. Since both are divisible by 3, we can divide both numbers by 3.
You can find this by first starting with the original question.
Now to solve a division problem with fractions, you can always flip the second one and turn it into multiplying.
Now we can multiply numerator by numerator and denominator by denominator.
Then of course, we need to simplify. Since both are divisible by 3, we can divide both numbers by 3.