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Vikentia [17]
3 years ago
9

Question 9 of 10 Which vector is the sum of vectors ä and ? Б

Mathematics
1 answer:
KonstantinChe [14]3 years ago
3 0

Answer:

its c

Step-by-step explanation:

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9x-2y=-21 2x+3y=16 Substitution
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9x-2y=-21 \\\\  9x=-21+2y \\\\ => \boxed{x=\frac{2y-21}{9}} \\\\ 2x+3y=16 \\\\ 2*\frac{2y-21}{9}+3y^{(9}=16^{(9} \\\\ 2(2y-21)+27y=144 \\\\ 4y-42+27y=144 \\\\ 31y=144+42 \\\\ 31y=186 \\\\ \boxed{y=\frac{186}{31}=6} \\\\ x=\frac{2*6-21}{9} \\\\ x=\frac{12-21}{9} \\\\ x=\frac{-9}{9} \\\\ \boxed{x=-1}
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