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jeyben [28]
3 years ago
12

-2+y=9 3x-7y=3 solve the system by the substitution

Mathematics
1 answer:
REY [17]3 years ago
5 0

Answer:

80/3 or 26 2/3

Step-by-step explanation:

-2 + y = 9 (subtract y from both sides)

-2 = 9 - y (subtract 9 from both sides)

-2 - 9 = y (multiply both sides by -1)

2 + 9 = y (simplify)

11 = y (substitute)

3x - 7 (11) = 3 (multiply)

3x - 77 = 3 (subtract 3 from both sides)

3x - 80 = 0 (subtract 3x from both sides)

-80 = -3x (multiply both sides by -1)

80 = 3x (divide both sides by 3)

80/3 = x (simplify if needed)

26 2/3 = x

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Shopping at super sales day, martha buys her children 3 shirts and 2 pairs of pants for $85.50. She returns during the sale and
Leviafan [203]

Answer:

  • Shirt costs $10.50, pants cost $27

Step-by-step explanation:

<h3>Set equations as follows</h3>
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<h3>Solve the system by elimination</h3>

Multiply the first equation by 4 and the second one by 3 and subtract equations

  • 4(3s + 2p) - 3(4s + 3p) = 4(85.5) - 3(123)
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Find the value of s

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3 years ago
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Answer:

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Step-by-step explanation:

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