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svlad2 [7]
3 years ago
5

Simplify the expression: 7 - 7(5 + x) - 9x Your answer

Mathematics
1 answer:
Gekata [30.6K]3 years ago
5 0

Answer:

-16x-28

Step-by-step explanation:

Break it into little pieces; start with distributing the -7:

-7(5+x)

-35-7x

Now add the rest of the problem: 7-35-7x-9x

Combine like terms: 7-35               7x-9x

7-35=-28             7x-9x=-16x

Rearrange so the coefficient and variable are upfront, giving you:

-16x-28

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Step-by-step explanation:

I will solve your system by substitution.

(You can also solve this system by elimination.)

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Step: Solve −x+4y=4 for x:

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−x=−4y+4

-x/-1 = -4y+4/-1 (Divide both sides by -1)

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Step: Substitute 4y−4 for x in −x+3y=1:

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Step: Substitute 3 for y in x=4y−4:

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x=(4)(3)−4

x=8(Simplify both sides of the equation)

<u>Answer:</u>

x=8 and y=3

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