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Julli [10]
3 years ago
13

8х + 7y= -5 X= -3y - 7

Mathematics
2 answers:
GrogVix [38]3 years ago
4 0

Answer:

x = 2

y = -3

Step-by-step explanation:

Step 1: Write systems of equation

8x + 7y = -5

x = -3y - 7

Step 2: Solve for <em>y</em>

  1. Substitute 2nd equation into 1st: 8(-3y - 7) + 7y = -5
  2. Distribute 8: -24y - 56 + 7y = -5
  3. Combine like terms: -17y - 56 = -5
  4. Add 56 to both sides: -17y = 51
  5. Divide both sides by -17: y = -3

Step 3: Solve for <em>x</em>

  1. Substitute <em>y</em> to find <em>x</em>: x = -3(-3) - 7
  2. Multiply: x = 9 - 7
  3. Subtract: x = 2

Step 4: Check

<em>Plug in x, y into an original equation to verify it's a solution.</em>

2 = -3(-3) - 7

2 = 9 - 7

2 = 2

Inessa05 [86]3 years ago
4 0

Answer:

x=2  y=-3

Step-by-step explanation:

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3 years ago
Which expression is NOT equal to 125? (1 point)
DENIUS [597]
Choice 1:
= 5 * [5^3 / (2/5)]^2
= by looking at the equation, it's kinda not equal to 125

choice 2:
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choice 3:
= 5^-2 / 5^-5
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choice 4:
= 5 * 5^5/5^3
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= 5^3
= 125

So the expression that is not equal to 125 is:
<span>5 times the quotient 5 cubed over two-fifths, raised to the second power</span>
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3 years ago
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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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180 - 64

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7 0
3 years ago
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