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-Dominant- [34]
3 years ago
9

Please help)Simplify: (r – 7)(r + 7)

Mathematics
2 answers:
PtichkaEL [24]3 years ago
5 0

Answer:

Im pretty sure the answer is

C) r^2 - 49

Step-by-step explanation:

Serggg [28]3 years ago
4 0

Answer:

r^2-49

Step-by-step explanation:

r^2+7r-7r-49 || r^2-49

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X/3 +2y/3= -1 and x-y/3=9 solve. by elimination method​
Galina-37 [17]

Answer:

X=51/7, Y= -36/7

Step-by-step explanation:

X/3 + 2y/3 = -1 equ 1

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eliminate X/3.

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X - y/3 = 9 ...... x 1/3 ( co-efficient of X in equ1 )

X/3 + 2y/3 = - 1 equ 3

-

X/3 - y/9 = 3 equ 4

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y = -36/7

( input the value of y into equ 4 )

X/3 -y/9 = 3

X/3 - (-36/7)/9 = 3

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X = 459/63

X = 51/7.

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