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mina [271]
3 years ago
5

Could someone please help me with #7 and #8?

Mathematics
2 answers:
Tasya [4]3 years ago
7 0
7. Plug in 3x + 8 for y in second equation
2(3x + 8) = 6x + 16
6x + 16 = 6x + 16
It would be all solutions

8. Plug in 4x + 5 for y in second equation
12x - 3(4x + 5) = 9
12x - 12x - 15 = 9
12x cancels out
-15 = 9
There would be no solution
Virty [35]3 years ago
4 0

Answer: I'm not sure If i'm right because I did this since 8th grade.

For number 7, I think it would be (the equation form)= 6 x  +  16

For number 8, I think it would be nothing because there is no solution.

Hope this helps:)

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Complete the sentence to explain how to use mental math to express 12/25 as a percent
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Answer: It's 48%. See below.

Step-by-step explanation:

By definition, percent means out of a hundred. For instance, 10 percent is 10 out of 100.

One way to make \frac{12}{25} a percent is by making the denominator 100. In order to do so, multiply the numerator and the denominator by 4, since 25 times 4 is 100.

\frac{12}{25}  =  \frac{48}{100} = 48 %

This is very simple, and mental math is definitely possible. Hope this help.  

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2 years ago
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faust18 [17]
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7 0
3 years ago
Read 2 more answers
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Katena32 [7]

Answer:

Step-by-step explanation:

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so both are equal.

8 0
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Step-by-step explanation:

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