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ololo11 [35]
3 years ago
11

9x-2y=-21 2x+3y=16 Substitution

Mathematics
1 answer:
hjlf3 years ago
3 0
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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Vitek1552 [10]

Answer:

4 weeks

Step-by-step explanation:

Wyatt's equation:

t=14w+40

Julian's equation:

t=19j+20

Since both equations equal the same thing, or <em>t, we can equal them against each other as 1 equation</em>

14t+40=19t+20

(subtract 20 from both sides)

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(subtract 14t from both sides)

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(divide both sides by 5)

t=4 weeks

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3 years ago
The average of your three quizzes grades is 17 points. Two of your quiz grades are 14 points and 19 points. Write and solve an e
Rainbow [258]
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7 0
3 years ago
Can someone please help mee (will give brainliest 20 points!!!)
Mice21 [21]

  [a] x = 175 - 7.5p

For a, we are isolating the x variable to one side of the equation.

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For b, we are solving for x when p = 8.

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7 0
2 years ago
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3 years ago
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scoundrel [369]

Answer:

True

Step-by-step explanation:

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