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The SUM is 31over63. When adding two fractions with uncommon denominators you give them a common denominator by multiplying the denominators. Then multiply the numerators by which their denominator was multiplied. This keeps the problem balanced. You would then have -18over63 plus 49over63. -18 plus 49 equals 31, giving you 31over63.
If you needed to divide negative 2 over 7 by 7 over 9, the answer would be -18/49 because you 'keep' the first fraction, 'change' the function to multiplication, and 'flip' the second fraction when dividing fractions.
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Earn +20 ptsQ: What is the sum of negative 2 over 7 plus 7 over 9?
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