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KatRina [158]
2 years ago
14

Simplify: n(8n−6)+10(7−n)=2

Mathematics
2 answers:
garik1379 [7]2 years ago
8 0
I think i’m may be ‘B’ i’m so sorry if i’m incorrect!!
damaskus [11]2 years ago
8 0

Answer:

B. 8n²−16n=−68

Step-by-step explanation:

First - Distribute the n & 10

n * 8n & n * -6 = 8n² - 6n

10 * -n & 10 * 7  = -10n +70

Second -  Move the 2 by subtracting

8n² - 6n - 10n +70 = 2 -> 8n² - 6n - 10n +70 - 2 = 2 - 2

Third - Combine like terms

-6n - 10n = -16n

70 - 2 = 68

8n² - 16n + 68 = 0

Fourth - Move 68 by subtracting

8n² - 16n + 68 - 68 = 0 - 68

8n² - 16n = -68

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Y = 5x + 5
y - x = 5

You can use substitution to solve this system. Use y's expression (5x + 5) for y in the second equation to solve for x:

y - x = 5
5x + 5 + x = 5
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x = 0

Substitute your value for x into one of the original equations to y:

y = 5x + 5
y = 5(0) + 5
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Finally, substitute both values into both original equations to check your work:

5 = 5(0) + 5    -->    5 = 5    <--True
5 - 0 = 5    -->    5 = 5    <--True

Answer:
x = 0
y = 5
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