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san4es73 [151]
3 years ago
6

What's substitution for: X=y-7 X+8y=2

Mathematics
1 answer:
MrRissso [65]3 years ago
4 0
\left \{ {{x=y-7} \atop {x+8y=2}} \right. \\\\
substitute\ x=y-7\ into \ the\ second\ equation\\\\
y-7+8y=2\\\\
9y-7=2\ \ \ | add\ 7\\\\
9y=9\ \ \ | divide\ by\ 9\\\\
y=1\\\\x=y-7=1-7=-6
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Read 2 more answers
Translate into an algebraic expression: n−1 increased by 110%
lorasvet [3.4K]

Answer:

Part 1) The algebraic expression is equal to 1.10(n-1)  or 1.10n-1.10

Part 2) The algebraic expression is equal to \frac{1.10}{n}

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Part 1) we have (n-1) increased by 110%

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so

The algebraic expression of (n-1) increased by 110% is equal to multiply 1.10 by (n-1)

1.10(n-1)

Distributed

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Part 2) we have n^(-1) increased by 110%

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Remember that

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4 0
4 years ago
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2 years ago
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Rudiy27

Answer:

-  \frac{8}{5}

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