3 years ago

I need help again on math ):

Mathematics

1 answer:

adoni [48]3 years ago

4 0

Answer:

D. 10x-20

Step-by-step explanation:

The perimeter is just all four sides added together

(3x-2)+(3x-2)+(2x-8)+(2x-8)

add together like terms

3x+3x+2x+2x=10x

-2+-2+-8+-8=-20

write in order

10x-20

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-5y=-5 7x+6y=7 is (5,1) a solution of the system? PLEASE HELP!!!!

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answer:

$( \frac{1}{7}, 1)$

explanation:

$- 5y = - 5 \\ 7x + 6y = 7 \\ divide \: both \: sides \: by \: - 5 \\ \\ y = 1 \\ \\ 7x + 6y = 7 \\ substitute \: the \: value \: of \: y \: into \: an \\ equation \\ \\ 7x + 6 \times 1 = 7 \\ multiply \: 6 \: to \: 1 \\ \\ 7x + 6 = 7 \\ subtract \: 6 \: from \: both \: sides \\ \\ 7x = 1 \\ divide \: both \: sides \: by \: 7 \\ \\ x = \frac{1}{7} \\ \\ (\frac{1}{7}, 1)$