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Cerrena [4.2K]
3 years ago
14

Y = -3x +10 3x +y = 5 substitution method

Mathematics
1 answer:
spayn [35]3 years ago
3 0

Answer:

no solutions

Step-by-step explanation:

y = -3x +10

3x +y = 5

Substitute the first equation into the second equation

Let every instance of y in the second equation be replaced with -3x+10

3x+ (-3x+10) = 5

Combine like terms

10 =5

This is never true so there are no solutions

(These are parallel lines with the same slope but different y intercepts)

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The store paid $2.70 for a book and sold it for $6.20. What is the profit as a percent?
Alenkinab [10]

Answer:

129.6% profit

Step-by-step explanation:

1)Firstly in order to find the overall profit you take away $2.70 from $6.20 = $3.50

2)The next step is to put the profit over the amount paid = 3.50/2.70 = 35/27.

3)In order to find the percentaage you multiply 35/27 by 100 = 129.629 recurring. This rounded to 1 decimal place is 129.6%

Thank you for reading, please let me know if I've missed anything out!

5 0
3 years ago
Brighten is an expression that shows how to multiply 7 * 256 using expanded form and distributive property
charle [14.2K]

I am not familiar with "brighten" but this is how you can expand and use the distributive property:

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= 7(200 + 50 + 6)

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= 1400 + 350 + 30

= 1780

4 0
3 years ago
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padilas [110]

Answer:

<em>- 4</em>

Step-by-step explanation:

( 3 - r ) / ( 1 + 5) = 7/6

\frac{3-r}{1+5} = \frac{7}{6} ⇒ 3 - r = 7 ⇒ r = <em>- 4</em>

7 0
3 years ago
Complete the following sentence:
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Answer:

It would be 70 thousand

Step-by-step explanation:

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2 years ago
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